MOLEAER LOTUS User manual

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
IMPORTANT: READ, FOLLOW AND
SAVE THESE INSTRUCTIONS
CUSTOMER SERVICE / TECHNICAL SUPPORT
If you have questions or need to order
replacement parts, please contact:
CUSTOMER SERVICE:
Monday to Friday: 8:00 a.m. to 5:00 p.m. PST
Phone: [phone]
Email: [email protected]
WEBSITE:
www.moleaer.com

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com i
Table of Contents
Safety...................................................................................................................................................................................... 2
General Warnings ............................................................................................................................................................... 2
General Information .............................................................................................................................................................. 3
Key System Components.................................................................................................................................................... 3
Quick Startup Guide ............................................................................................................................................................. 4
Suction and Discharge Verification ..................................................................................................................................... 4
Typical Operating Parameter Ranges................................................................................................................................. 5
Specifications ........................................................................................................................................................................ 5
Power Input Requirements.................................................................................................................................................. 5
Gas Connection................................................................................................................................................................... 5
Technical Specs .................................................................................................................................................................. 5
Included Accessories .......................................................................................................................................................... 6
Piping Specifications ........................................................................................................................................................... 5
Pump Specifications............................................................................................................................................................ 6
Installation & Startup ............................................................................................................................................................ 6
Pipe Assembly..................................................................................................................................................................... 7
Connecting the Oxygen....................................................................................................................................................... 8
System Operation ................................................................................................................................................................. 8
Startup................................................................................................................................................................................. 9
Continuous Operation ......................................................................................................................................................... 9
Timed Operation.................................................................................................................................................................. 9
Testing for DO ..................................................................................................................................................................... 9
Regulator/Flow Control...................................................................................................................................................... 10
Pump Maintenance ............................................................................................................................................................. 11
Drawings .............................................................................................................................................................................. 14
Solvent Welding PVC Pipe ................................................................................................................................................. 16
Cleaning and Sanitizing...................................................................................................................................................... 17
Operation Checklist ............................................................................................................................................................ 19
Preventive Maintenance Checklist - Recommended Monthly ........................................................................................ 20
Troubleshooting Guide....................................................................................................................................................... 21
Limited Warranty................................................................................................................................................................. 22

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 2
Safety
This guide provides operation and
maintenance instructions for this product.
Consult Moleaer with any questions
regarding this equipment.
This Lotus nanobubble generator is for INDOOR USE
WITH OXYGEN ONLY.
READ AND FOLLOW ALL INSTRUCTIONS.
This is the safety alert symbol. When you
see this symbol on your system or in this
manual, look for one of the following
signal words and be alert for potential
injuries.
Warns about hazards that can cause
death, serious personal injury, or major
property damage if ignored.
Warns about hazards that may or can
cause minor personal injury or property
damage if ignored.
NOTE Indicates special instructions not related
to hazards. Carefully read and follow all
safety instructions in this manual and on
equipment. Keep safety labels in good
condition; replace labels i
f missing or
damaged.
When installing and using this electrical equipment, basic
safety precautions should always be followed.
Risk of Electrical Shock
Connect only to a branch circuit protected by a ground fault
circuit interrupter (GFCI). Contact a qualified electrician if
you cannot verify that the circuit is protected by a GFCI.
General Warnings
Never open the inside of the pump motor enclosure. There
is a capacitor bank that holds electrical charge even when
there is no power to the unit.
Code requirements for the electrical connection differ from
location to location. Install equipment following all
applicable local codes and ordinances.
Before servicing the pump, remove power from the system
by unplugging the unit from the outlet.
This equipment is not intended for use by persons
(including children) of reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning
the use of the appliance by a person responsible for their
safety.
RISK OF ELECTRICAL SHOCK. INSTALLERS,
OPERATORS, AND OWNERS MUST READ
THESE WARNINGS AND ALL THE
INSTRUCTIONS IN THE OWNER’S MANUAL
BEFORE USING THIS UNIT. THESE WARNINGS
AND THE OWNER’S MANUAL MUST BE LEFT
WITH THE PRODUCT OWNER.
Suction Entrapment Hazard
Stay off the main drain and away from all suction outlets!
This generator produces high levels of suction and creates
a strong vacuum at the main drain (located at the bottom of
the body of water). This suction is strong enough to trap
adults or children underwater if they come in close proximity
to a drain, a loose or broken drain cover, or a grate.
Install all electrical equipment, such as ON / OFF
switches, timers, and control systems, etc. to allow
the operation (startup, shutdown, or servicing) of
any pump or filter so the user does not place any
portion of his / her body over or near the pump
str
ainer lid, filter lid, or valve closures. This
installation should allow the user enough space to
stand clear of the filter and pump during system
startup, shutdown or servicing of the system filter.
Hazardous pressure. Stand clear of pump and filter
during startup. Circulation systems operate under
pressure, when servicing any part of the system, air
can enter the system and become pressurized.
Pressurized air can cause any part of the pump, filter
or valves to violently separate which can result in
severe personal injury. Filter lid must be properly
secured to prevent separation. Stand clear of all
circulation system equipment when starting pump.
Before servicing equipment make note of system
pressure before opening filter basket.

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 3
General Information
Read instructions thoroughly prior to installation and use.
All Lotus products are factory adjusted for optimal
nanobubble production. Note that the actual unit sold
may differ slightly from the description in the manual without
any difference in the functionality and performance of the
unit.
The Moleaer Lotus product is a nanobubble gas-injection
technology tailormade for the horticulture market. Its
principal function is to improve the economics of using
oxygen for better quality of irrigation water, promote plant
growth, and suppress disease. With simplicity and near-
perfect efficiency, the Lotus nanobubble generator super
saturates irrigation water with dissolved oxygen and trillions
of negatively charged nanobubbles. These tiny bubbles,
about 100x smaller than a red blood cell, have several
unique physical properties that make them behave
differently from normal bubbles. Nanobubbles are neutrally
buoyant and remain stable in solution for prolonged periods
of time, creating an oxygen buffer in the water. The
combination of the Lotus’s high oxygen transfer efficiency
and stable oxygen-enriched nanobubbles enable higher
oxygen transfer into the root zone while facilitating nutrient
absorption and pathogen suppression.
Key System Components
Figure 1. Lotus Weather-Proof Steel Cabinet
1. Cabinet
2. On/Off indicator light
3. Cooling air discharge
4. Water pump inlet
5. Connection port (Barb fitting included in parts) for
external oxygen supply.
6. Water pump outlet
Figure 2. Lotus Pump & Piping
1. 1.5HP self-priming pump with strainer basket
2. Water Inlet
3. Nanobubble generator
4. Gas injection fitting
5. Check valve
Figure 3. Lotus Gauge and Electrical Panel
1. Electrical box
2. Water pressure gauge
3. Gas pressure gauge
4. Rotameter

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 4
Figure 4. Lotus Solenoid Valve
1. Solenoid valve
2. Gas Inlet
Quick Startup Guide
1. Connect the regulator to the O2 tank, set the dial to
0.
2. Connect the air fitting to the Lotus enclosure.
3. Connect the gas tube between the regulator and
the air fitting. Use the snap-grip clamps for
securing the tube.
4. Turn the regulator knob to the lowest settings and
check for leaks using soapy water spray.Turn the
regulator dial back to 0.
5. Open the enclosure of the Lotus by lifting the lid of
the box. Open any isolation valves between the unit
and tank on both the inlet and discharge pipes.
6. Hand-tighten any loose fittings.
7. Loosen the strainer basket lid from the pump by
turning it counterclockwise.
8. With flooded suction, the basket should be filled by
gravity. Please see the detailed operating manual
for non-flooded suction installations.
9. When the pump strainer fills with water, tighten the
pump strainer basket lid by turning the lid
clockwise.
10. Turn the Lotus on by pushing the start button.
11. Check that water is flowing through the pump by
verifying that the strainer basket is filled with water.
12. Turn the regulator knob to ¼ (1/4 lpm). Check for
any leaks inside the enclosure at various
connection points.
If the pump does not prime after several minutes, turn the
Lotus off, review all suction pipe field connections to ensure
airtight connections, all valves are open, and try again. Wait
five minutes before re-priming to allow the pump seals to
cool.
Once primed, large bubbles or a large air pocket should not
be visible in the strainer basket. Any visible large bubbles
or an air pocket in the strainer basket is an indication of a
suction pipe leak. Check suction pipe for leaks and ensure
all pipe connections are airtight.
Once the pump is primed and the system is pumping water,
visually check for leaks inside the unit and hand tighten any
fittings that may be leaking, if hand tightening doesn’t stop
leaks, shut the unit down, close isolation valves, and
disassemble the connections to inspect for any pinched O-
rings and that pipes are aligned properly and reassemble.
Suction and Discharge Verification
Observe the suction and discharge locations in the tank.
The intake should not create a vortex at the surface. If a
vortex is visible, the intake is not properly submerged,
adding a 90 inside the tank at the intake parallel to the floor
should eliminate this issue. The bubble pattern visible at the
surface of the water above the discharge should consist
primarily of small bubbles, roughly the size of a pea or
smaller. For maximum oxygen transfer, it is important to
avoid causing turbulence and splashing as well as
disrupting surface tension when discharging. Take care to
plan out a discharge path that will cause as little disruption
as possible and discharges below the surface of the water.
Figure 5. Lotus Tank Installation by Water Level

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 5
Typical Operating Parameter Ranges
The typical operating parameter ranges for the Lotus are
shown in Table 1.
Table 1. Lotus Typical Operating Parameter Ranges
Parameter LOTUS
Gas Pressure (Gauge) 10 –20 psig (0.7 – 1.4 barg)
Liquid Pressure
(Gauge) 10 –20 psig (0.7 – 1.4 barg)
Gas Flow Rate
(Rotameter)
0.1 – 0.5 cfh (0.05 – 0.24
lpm)
Specifications
Failure to install the Lotus
within the limits
specified in these specifications may void the
system warranty and result in poor nanobubble
production and pump cavitation.
Power Input Requirements
Table 2. Lotus Power Input Requirements
60 Hz (North America) Single Phase, 115 VAC
50 Hz Single Phase, 230 VAC
Pipe lengths and unit elevations can play an important role
in the performance of the pump. Refer to the Appendix for
additional detail regarding the recommended operating
envelope for this unit.
Gas Connection
Moleaer Lotus generators come with a ¼” barb fitting. The
unit is designed to be used with industrial-grade oxygen.
Technical Specs
Table 3. Lotus Technical Specifications
Temperature Tolerance, F 40-140
Solids, inches <3/8
Voltage 120
Phase 1
Running Amps (Standard
Household 15 Amp Outlet) 8.2
Piping Specifications
Table 4. Lotus Piping Specifications
Nominal Pipe Size 1.5 in (63 mm)
Maximum Suction Pipe Length 20 feet/4 meters
Maximum Total Pipe Length
(Suction + Discharge) 40 feet/8 meters
Recommended maximum
Suction Lift
6 feet (2 m) above
water surface

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
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Pump Specifications
Table 5. Lotus Pump Specifications
Equipped Pump Brand:
Anbull SP-1100A or
equivalent
Power 1.5 HP / 1.1 kW
Start Amperage 11.5 A
Voltage 115/230 VAC
Hertz 50/60 Hz
Capacitor 50 μF/250V
Flow Rate
10 – 20 GPM / 2.27 –
4.6 m3/h
Head 50 ft / 15.5 m
Temperature (Max) 120˚F / 50C˚
Installation & Startup
Customers are responsible for meeting all installation
guidelines recommended in this section.
Parts and Accessories
The parts and accessories shown in Table 6 are shipped
loose with all Lotus products.
Included Accessories
Table 6. Lotus Accessories
Image Line
Item
QTY LOTUS
1 1
Regulator for Oxygen
tank with CGA-540
connector
2 1 Gas Tube
Image Line
Item
QTY LOTUS
3 1 Air Fitting
4 1 CIP Tool
5 5* Snap-Grip Clamps
6 1 Pump Union
7 2 Pump Union O-Ring
8 1 Pipe Union
9 1 Basket Strainer O-Ring
10 1 Cabinet Keys
11 1 Quick Start Guide
*Only 2 required. 3 additional
included as spares
The unique site conditions for each site should be carefully
considered when identifying the Lotus installation location.
Refer to the Location Requirements section of this guide for
additional details.
Upon delivery, unbox and inspect the Lotus for any damage
or loose parts that may have occurred during transport.
Hand-tighten any loose unions.

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 7
Location Requirements
Place the unit on level hard ground as close as possible to
a power source. Use a concrete pad or pavers to level the
placement position
Parts, Tools, and Materials
The following is a list of various parts, material and tools
required for installation and startup of the equipment. As
each installation is unique, this is not an exhaustive but a
recommended list.
•PVC Glue
•PVC saw
•PVC pipe primer and PVC pipe cement
•PVC Pipe or hose and fittings to connect to the
tank.
•Wrench
•Pliers
•Level
•Smoke pen for checking leaks on the suction line
•Spray bottle of soapy water for detecting gas
leaks
•Miscellaneous items including tape measure,
marking pencil, shop towels for cleaning, etc.
Pipe Assembly
All PVC pipe connections must be solvent welded
using PVC cement. Use Schedule 40 polyvinyl chloride
(PVC) pipe and fittings. Use PVC cement formulated for wet
conditions and fast installation to connect PVC pipe to PVC
fittings. Do not use black, acrylonitrile butadiene styrene
(ABS) piping or mix ABS pipe or fittings with PVC pipe or
fittings. Where necessary, use proper piping support
structures to avoid excessive pipe strain.
All PVC pipe connections must be airtight and leakproof.
Failure to provide airtight suction pipe connections
may negatively impact nanobubble generator
performance. Large bubbles visible at the pump strainer
basket are an indication of suction pipe leaks. Check for
and correct all suction and discharge pipe leaks prior to
startup.
Proper technique must be used when gluing PVC pipe and
fittings to ensure an airtight, leakproof connection. For
proper technique, refer to the Appendix. Allow for proper
cure time before wet testing suction and discharge pipes.
Installation
The installation diagrams for the Lotus are shown in Figures
11 and 12.
Refer to the pipe connections extending from the base of
the Lotus that are shown in Figure 11. Using PVC primer
and cement, glue elbows to the first straight, horizontal pipe
segments of the suction and discharge piping, and then
complete the pipe connections. This may be tied into an
existing pipe system, or the installation of a new pipe may
be required.
The intake and discharge ports on the Lotus are both 1.5”
(63 mm) union fittings. Connect the inlet pipe to the pump
(right-hand side) and discharge pipe to the union on the left-
hand side.
If desired place union valves (not supplied) on either side
of the Lotus so it can be isolated for service.
Connect the intake side low on the tank so that the intake
is always flooded and connect the discharge return piping
higher on the tank, being sure to avoid splashing the water
from the return line into the tank.
If the unit is installed in a multi-tank system, ensure that the
overflow piping connecting tanks is capable of handling 20
GPM (4.6 m3/h).
Piping
Locate and install the discharge pipe following the
recommendations detailed in Figures 11 and 12.
Use available fittings as necessary to route the discharge
piping from the Lotus to the Tank
Power Input
Extension cord use is hazardous and should be
avoided. In certain jurisdictions, permanent
installation using an extension cord is not
permitted. Check with your local electrical code.
Step 1. The Lotus requires a dedicated, weather-resistant
power receptacle. After starting the Lotus, perform a
voltage drop test to verify voltage is within normal limits.
Step 2. When all piping is installed, cure time has been
met, and proper circuit operation has been verified, you are
ready to start up normal operation of the Lotus.

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 8
Connecting the Oxygen
The Moleaer Lotus nanobubble generator is designed for
use with compressed oxygen only.
Do NOT mix gases with this system.
All gas fittings and hoses must be maintained free
from oil and lubricants.
DO NOT PERMIT SMOKING OR OPEN FLAMES
IN ANY AREAS WHERE OXYGEN IS STORED OR
HANDLED. THE LOTUS GENERATOR MUST BE
SEPARATED FROM FLAMMABLES AND
COMBUSTIBLES BY AT LEAST 20’ (6 METERS)
OR HALF-HOUR FIREWALL.
Gas Flow and Pressure
Inspect the cylinder following the instructions of your gas
supplier. Be sure to inspect the regulator to see if the
sealing washer is in place on the inlet to the regular.
Connect the gas regulator to the feed gas tank to supply
the Lotus. Connect the hose between the supplied regulator
and the hose barb on the right side of the Lotus. Install hose
clamps. Open the valve on Gas tank slowly
(counterclockwise), about one full turn. If you hear a hissing
sound, there is a leak in the system. Turn the cylinder off
and turn the regulator on to relieve any built-up pressure.
Try tightening the regulator to the cylinder and opening the
cylinder again. If this does not help, shut the system down
again and contact a service representative. NEVER attempt
to repair a regulator or cylinder yourself.
Adjust flow on regulator dial by turning the knob clockwise
until the desired setting shows through the window. The
readings indicated are in liters per hour.
Spray soapy water to gas fittings and connectors to ensure
there are no gas leaks. If leaks are detected, then tighten
the hose clamps.
Gas flow rates can be adjusted depending on the
application and desired effect. The Lotus generators are
designed to deliver a spectrum of nano and/or micro
bubbles to meet the requirements of the process or
application. Low gas flow rates produce more nanobubbles
and have a higher gas transfer efficiency, whereas higher
gas flow rates produce both nano and microbubbles that
have a lower gas transfer efficiency, but higher mass
transfer rate. Refer to the specification Table 1 for
suggested gas flow rates.
If the cylinder pressure falls below 300 psi (20.5 bar), you
should exchange the cylinder for a full one. Turn off the
system, close the cylinder valve, wait for the oxygen to flow
out of the regulator, and turn the regulator to the “0”
position. NEVER try to remove the regulator unless the
cylinder is off, and pressure has been relieved.
System Operation
Pump must be fully primed before initial operation.
The pump is capable of self-
priming if there is
sufficient water in the pump strainer basket.
Operation at or near zero flow can cause extreme
heat, personal injury, or property damage.
1. Open the intake and discharge valves to flood
piping and prime the pump. Pump is primed by
removing the strainer lid, filling the basket with
water, and replacing the lid before starting. It
will take a few minutes for the pump to reach
full flow and the strainer basket is full, as can
be seen through the lid.
NOTE: If the Lotus generator is located above the
water line of the tank or water body, it is important to
install a check valve on the end of the intake.
Leaks in suction piping may only be visible while the
pump is off, and piping is flooded. Leaks in suction
piping may draw air into the system and impact
performance.
Press start switch to activate “ON” and run pump at normal
operating conditions and check the piping for visible leaks.
If necessary, adjust the pipe supports.
NOTE: Normal operating pressure range on the pump is
between 13 PSIG and 25 PSIG (0.9 BAR to 1.7 BAR). Pump
flow rates should be +/- 10% of the system’s designed flow.
Pump flow rates lower than the system specifications will
result in larger bubbles and lower oxygen transfer
efficiencies – it is NOT recommended.
Do NOT exceed 25 PSI (1.72 BAR) on pump
pressure.
Every Lotus unit comes with a rotameter (see general
arrangement). However, the flow should be controlled by
the regulator, with the rotameter knob in the fully open
position.

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 9
Table 7. Lotus Flow Rates
Model
Maximum Gas
Flow (CFH / LPM)
Optimal Gas Flow
(CFH / LPM)
Lotus 4 / 2.0 1 / 0.5
Startup
1. Remove the pump basket lid by rotating
anticlockwise.
2. Using a bucket, prefill the pump basket with
approximately one gallon of water.
3. Reinstall the basket lid, until it is hand tight.
4. Plug the unit power cord into the outlet.
5. Push start switch to start system.
6. Wait until the pump basket fills with water, which
can take up to five minutes.
Continuous Operation
Continuous Operation can be selected by toggling the start
switch to the “ON” position.
When Continuous Operation is desired, the system will run
continuously as long as power is supplied.
The gas injection zone (nanobubble generator) may require
periodic cleaning due to built-up inside the piping. If a
reduction in gas flow is observed on the rotameter, or the
gas pressure gauge increases by greater than 15% from its
starting pressure, or if the water pressure decreases by
20% from its initial pressure, cleaning is necessary.
Please refer to Moleaer’s Clean-in-Place section of this
manual for more information.
Timed Operation
Figure 6. Digital Timer Example
If timed operation is desired, purchase a programmable
timer capable of handling a 15 Amp circuit and program to
start and stop as desired. The one shown above is one of
many available online with Wi-Fi functionality and an app
for controlling remotely. A typical timed program would be
to start the unit a couple of hours before watering and shut
it off when a certain desired Dissolved Oxygen level is
reached which can be determined after a few days of
operating the unit. This time will vary based on
environmental factors, such as temperature, the volume of
water in tank, total water used daily, level of fertilizers and
types of fertilizer. If water is required at different intervals
during the day, the timer can be operated in bursts of a
minimum of one hour at a time.
Testing for DO
Figure 7. DO Probe Example
If you would like to control for Dissolved Oxygen
concentrations, purchase a meter that will test up to 40
ppm. Several are available online. Growers have reported
values for good plant growth should be in the range of 14-
25 ppm. Be sure to read the instructions that come with the
meter when setting it up for the first time and calibrate it
according to the manufacturer’s instructions regularly.
Once the Lotus nanobubble system is operating normally,
and the water in the tank is freshly filled, test the DO level
continuously while letting the Lotus run, and when the
desired DO level is reached make a note of the run time
and set up the timer to run for that period (no less than one
hour). If the DO level is higher than desired within 1 hour,
then the gas flow rate on the regulator should be reduced.

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
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Regulator/Flow Control
Figure 8. Oxygen Regulator
The numbers on the dial correspond to liters per minute.
The range is from 0 – 4 liters per minute. The maximum
pressure the regulator will allow is 50 PSIG. The gauge on
the regulator indicates the gas pressure remaining in the
cylinder. The regulator gauge indicating in the red means
you should change cylinders. The regulator is designed to
attach to industrial gas cylinder the connector is a 540 CGA
fitting. Connect the regulator to the cylinder and tighten with
a crescent wrench. Do not over tighten; Do not use any oil;
Do not use thread tape or paste on the tank or the regulator
connections. Connect the supplied hose between the
Regulator and the Lotus, clamping the hoses with the
supplied hose clamps. Setting the flow rate will be based
on environmental factors, such as temperature, volume of
water in tank, total water used daily, level of fertilizers and
types of fertilizer. Growers have reported values for good
plant growth between ¼ and 1/2 liters per minute of Oxygen
flow. Do not exceed 2 liters per minute.

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 11
Pump Maintenance
Do NOT open the strainer basket if pump fails to
prime or if pump has been operating without water in
the strainer basket
. Pumps operated in these
circumstances may experience a buildup of vapor
pressure and may contain scalding hot water.
Opening the pump
may cause serious personal
injury. To avoid the possibility of personal injury,
make sure the suction and discharge valves are
open and strainer basket
temperature is cool to
touch, then open with extreme caution.
To prevent damage to the pump and for proper
operation of the system, clean pump strainer and
system regularly.
Opening the pump may cause serious personal
injury. To avoid the possibility of personal injury,
make sure the suction and discharge valves are
open and strainer basket
temperature is cool to
touch, then open with extreme caution. To prevent
damage to the pump and for proper operation of the
system, clean pump strainer and system every two
weeks.
Pump Strainer Basket Care
The strainer basket must be kept clean and free of debris.
Inspect basket through the lid on the top of the housing.
Be sure to visually inspect the strainer basket regularly.
Dirty strainer baskets reduce filter efficiency and put
abnormal stress on the pump motor. Bacterial fouling could
cause the lid not to be clear.
Cleaning the Pump Strainer Basket
1. Flip the switch to the OFF position and confirm the
red light turns on.
2. Relieve pressure in the system.
3. Close system isolation valves
4. Turn the lid counterclockwise and remove from the
pump.
5. Remove debris and rinse out the basket.
6. Put the basket back into the housing. Be sure to
align the notch in the bottom of the basket with the
rib in the bottom of the housing.
7. Fill the pump basket up to the inlet port with water.
8. Clean the lid and clamp, O-ring, and sealing
surface of the pump basket.
NOTE: It is important to keep the lid O-ring clean and well
lubricated.
Figure 9. Pump Specifications
9. Reinstall the lid by placing the lid on the basket. Be
sure the lid O-ring is properly placed. Seat the lid
on the pump then turn clockwise until tight.
10. Press the switch to the ON position. Confirm green
light turns on.
11. Wait until a steady water flow is observable through
the pump basket lid.

MOLEAER LOTUS
NANOBUBBLE GENERATOR
Owner’s Manual
www.moleaer.com 12
Winterizing
In mild climate areas, when temporary freezing conditions
may occur, run your equipment all night to prevent freezing.
You are responsible for determining when freezing
conditions may occur. If freezing conditions are expected,
take the following steps to reduce the risk of freeze
damage. Freeze damage is not covered under warranty.
To prevent freeze damage, follow the procedures below:
1. Shut off electrical power for the pump at the circuit
breaker.
2. Drain the water out of the pump housing by
removing the one twist drain plug from the housing.
Store the plug in the pump basket.
NOTE: Do not wrap motor with plastic or other airtight
materials during winter storage. The motor may be covered
during a storm, winter storage, etc., but never when operating
or expecting operation.
Figure 10. Pump Head Curve
PUMP SERVICE
Always disconnect power to the Lotus generator and
/ or pump at the circuit breaker before servicing the
pump. Failure to do so could result in death or
serious injury to service people, users or others due
to electric shock. Read all servicing instructions
before working on the pump.
Do NOT open the strainer basket if pump fails to
prime or if pump has been operating without water in
the strainer basket
. Pumps operated in these
circumstances may experience a build-up of vapor
pressure and may contain scalding hot water.
Opening the pump may cause serious personal
injury. In order to avoid the possibility of personal
injury, make sure the suction and discharge valves
are open and strainer basket temperature is cool to
touch, then open with extreme caution.
Be sure not to scratch or mar the polished shaft seal
faces; seal will leak if faces are damaged. The
polished and lapped faces of the seal could be
damaged if not handled with care.
Motor Care
Protect from Heat
1. Provide ample cross ventilation to prevent
overheating.
Protect Against Dirt
1. Protect from any foreign matter or splashing water.
2. Do not store (or spill) chemicals on or near the
motor.
3. Protect from any foreign matter or splashing water.
4. Avoid sweeping or stirring up dust near the motor
while it is operating.
5. If a motor has been damaged by dirt it voids the
motor warranty.
6. Clean the lid and clamp, O-ring, and sealing
surface of the pump basket.
Protect Against Moisture
1. If a motor has become wet, let it dry before
operating. Do not allow the pump to operate if it has
been flooded.
2. If a motor has been damaged by water the motor
warranty is voided.
Restart Instructions
If pump is installed below the water level, close return, and
suction lines prior to opening the strainer basket on the
pump. Be sure to re-open valves prior to operating.
Priming the Pump
The pump strainer basket must be filled with water before
the pump is initially started. Follow the steps below to prime
the pump:

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NANOBUBBLE GENERATOR
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1. Loosen the pump lid.
2. Allow pump strainer basket to fill with water.
3. Tighten the strainer basket lid. The pump is now
ready to prime.
The pump should not run longer than eight minutes
if priming is not achieved.
Do NOT run the pump dry. If the pump is run dry, the
mechanical seal will be damaged, and the pump will
start leaking. If this occurs, the damaged seal must
be replaced. ALWAYS maintain proper water level.
If the water level falls below the suction port, the
pump will draw air through the suction port, losing
the prime and causing the pump to run dry, resulting
in a damaged seal. Continued operation in this
manner could cause a loss of pressure, resulting in
damage to the pump case, impeller and seal and
may cause property damage and personal injury.

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Drawings
Figure 11: Lotus Isometric Installation Diagram
Figure 12: Lotus Installation Diagram from Top

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Owner’s Manual
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Figure 13: Lotus Enclosure Dimensions

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Solvent Welding PVC Pipe
•Once the primer has been applied to both surfaces,
the cement must be applied within 5 minutes. If not,
you MUST prime the surfaces again before
applying cement.
•Do Not use primer on ABS pipe and fittings.
•Remember that a thin coating of cement is
recommended inside the fitting hub to prevent
puddling. Puddling can cause weakening and lead
to joint failure.
•Assembly parts QUICKLY. Cement must be fluid.
Dried cement CANNOT be re-coated.
•Lower temperatures and larger diameter pipes may
need a little extra hold time
•Allow 15 minutes for good handling strength and 2
hours cure time. Longer cure times may be
required at low temperature. DO NOT TEST WITH
COMPRESSED AIR OR GAS.
How To Solvent Weld
Prior to Use:
1. Read all product labels carefully.
2. Stir or shake cement before using. If gelled, do not
use. Keep container closed when not in use. Avoid
eye and skin contact. Wear safety glasses with side
shields and wear rubber gloves.
3. Cut pipe ends square, Deburr the inside and
chamfer the outside of pipe ends, remove all dirt
from pipe ends and fitting hubs.
4. Pipe should easily go 1/3 to 2/3 the way into the
fitting hub.
5. Clean pipe and fitting hub with a listed cleaner.
6. First apply primer inside the fitting hub, then the
exterior of pipe end.
7. First apply liberal coat of cement to exterior of the
pipe end beyond fitting hub depth, then inside the
fitting hub.
8. Turn pipe ¼ of turn as you push the pipe end into
the fitting hub.
9. Make sure pipe end bottoms out inside the fitting
hub and hold for 30 seconds to prevent push-out.
10. Wipe off excess cement
Figure 14. How to Glue Piping
Set Up & Curing Times
The set up/cure time is dependent on several factors. The
pipe size, socket fit, ambient temperature, relative humidity,
solvent cement used and the system operating pressure
should all be considered when determining set up/cure
times.
DO NOT test PVC piping systems with compressed air or gas.
NOTES: Cure schedule is the time required before pressure
testing the system - This chart can be used as a guideline to
determine joint cure

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Cleaning and Sanitizing
Nanobubble Generators (NBGs) can become
contaminated after they have been used for some time.
Pollutants such as colloids, biofilms, mineral scale, and
biological matter build up over time. Contaminants can
result in decreased performance. Periodic cleaning is thus
very important and essential to optimal system
performance.
Cleaning of an NBG system when one or all of the following
operating conditions occur:
•The system is unable to reach 80% of specified
nominal gas flow with gas flow valve wide open.
•The normal increase in dissolved oxygen in one
pass has decreased by 25%.
•The pressure of the gas injection required to
maintain gas flow exceeds supply gas pressure.
If cleaning is delayed too long, complete recovery of the unit
may not be possible.
Safety Precautions
Maximum Temperature: 100°C (212°F.)
pH Tolerance Range: 2 to 14.
Each cleaning situation is different; therefore, specific
cleaning recommendations are dependent on the type of
foulant. Consult the general cleaning instructions for
information that is common to all types of cleaning, such as
suggested equipment, pH and temperature limits and
recommended flow rates; then apply the specific
recommendation as needed.
1. When using any chemical, follow accepted safety
practices. Consult the chemical manufacturer for
detailed information about safety, handling and
disposal.
2. When preparing cleaning solutions, ensure that all
chemicals are dissolved and well mixed before
circulating the solutions through the system.
3. It is recommended that the system be flushed with
good-quality water (20°C minimum temperature)
after cleaning. City water quality is recommended.
Flush the bulk of the cleaning solution from the
system before resuming normal operation.
Cleaning chemicals may be present on the treated
water side following cleaning, to avoid
contamination, the treated water can be diverted to
a drain for a few minutes or until the water is clean
when starting up after cleaning.
4. Ensure the system power is disconnected during
cleaning procedures to avoid accidental startup of
the pump or gas production system.
NOTE: The maximum temperature limit during cleaning is
45°C (113°F) for all PVC systems.
NOTE: The minimum and maximum pH limits for all PVC
systems are 1 and 13, respectively.
General Cleaning Procedures
The cleaning procedure of an nanobubble generator
system consists of the following process steps:
1. Turn off the pump and drain any water in the
system. Isolate the Lotus from the tank.
2. Assemble CIP kit. See Figure 10.
3. Prepare the cleaning solution.The chemicals
used for the cleaning process must be dissolved
and mixed before the cleaning fluid is added to the
nanobubble generator. Household Bleach, Lysol,
CLR or other commonly available cleaning
chemicals will remove any biological growth from
the Lotus internal mechanism.
4. Introduce the cleaning solution. Release the
clamp below the check valve, see Figure 11.
Disassemble the tube and the check valve and put
the CIP tube into the tube from the nanobubble
generator, see Figure 12. Slowly inject about 25 ml
of cleaning solution into the nanobubble generator.
5. Soak the cleaning solution. Allow the cleaning
solution to soak the nanobubble generator for a
minimum of 15 minutes.
6. Rinse the system. Using the same syringe, inject
clean water into the nanobubble generator to flush
the CIP solution out. Repeat 3 times. Generally,
after 3 flushes, the remainder of the solution is very
small and can be left inside the system.
7. Restart the system. Reconnect all the tubes and
pipes. Follow the startup process as described in
the start-up section of this manual.

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NANOBUBBLE GENERATOR
Owner’s Manual
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Figure 15. CIP Tubing
Figure 11. Location of Clamp and Check Valve
Figure 12. Clamp Disconnected and CIP Tube Inserted into
Nanobubble Generator

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Owner’s Manual
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Operation Checklist
Model Component Instructions
1 Power light Check the light. Green: Running; Red: Powered but not running, No
light: No power
2 Gas Leakage Use soapy water to check the gas leakage on the joints and fittings.
Check for signs of cracking on the tubing
3 Water
Pressure
Check water pressure gauge (8-20 Psi). Compare value with the
historical values on the checklist (included below)
4 Gas Pressure Check gas pressure gauge (8-24 Psi). Compare value with the
historical values on the checklist (included below)
5 Fan Make sure fan is clean and running.
6 Pump basket Stop the unit. Close isolation valves, remove the pump lid. Inspect and
clean the basket.
7 Pump Visual
inspection
Inspect the pump body. Look for signs of leakage, water, or heat
marks on the junction box
8 Rotameter Check rotameter value and compare with previous readings.
9 Air delivery
check
Detach tube from the check valve on the gas delivery tube and
confirm the gas flow.
10 Visual
inspection
Check gas tubing and look for spots with condensation, and heat
marks. Detach tubes to drain water inside tubes.
11 Power
interruption
test
Shut down the unit and power back on after 30 seconds. Monitor the
unit until it goes back to normal operation