Prio Expert M400 User manual

Prio®Expert
User’s Guide
M400
Under-sink (PoU)
Multi-stage Drinking
Water Ultraltration
Slim System

2
Before operating this appliance, please read the instructions carefully. You
may want to save this guide for your future reference. Failure to follow the
instructions or meet the operating requirements may lead to the product’s
failure, malfunction, property damage or personal injury.
Safety Warning
■Do not place the storage tank near the sources of heat, radiators, etc.
■Keep the appliance out of reach of pets or other animals.
■Do not use the appliance if operating requirements such as water tempera-
ture/water pressure/electrical supply, etc. are not met. There may be other
local regulations to comply with.
■Do not use the appliance with water that is microbiologically unsafe or of
unknown quality without adequate disinfection before or aer the system.
■Do not use the waste water produced by the appliance for drinking or cooking.
■Never store or operate the appliance in direct sunlight.
■This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction con-
cerning use of the appliance by a person responsible for their safety.
■Children should be supervised to ensure that they do not play with the
appliance.
■At the end of its life, the appliance should be disposed o in an appropriate
manner.
Disposal
Old appliances still contain many recyclable materials. Therefore, please take
used unit to your retailer or recycling center so that it can be recycled.

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Description
Congratulations on your purchase of the Prio® Expert ltration system! With proper instal-
lation and maintenance, it will provide you with high quality drinking water for many years.
This system signicantly reduces or removes dirt, sand, sediment and most harmful sub-
stances such as heavy metals, chlorine, microplastics, pollen, protists and other contami-
nants, improves water taste and odor.
Please familiarize yourself with the general concept behind the product and main modes
of operation.
Key Features:
■Clean and safe drinking water right at your sink. No need to transport and dispose
of bottled water anymore.
■High-quality multi-stage ltration.
■Factory-preinstalled lters for faster and easier setup.
■Quick-change lters for easy regular maintenance.
■Compact and beautiful slim design.
■Quick ttings for easy tube connections and change of lters.
Multi-stage Filtration:
Your system may include up to 4 lter cartridges installed out of ones listed below providing
advanced multi-stage water ltration for most needs and ultimate customer’s satisfaction.
■5-micron Sediment Poly Block Pre-lter.
■Coconut Carbon Block Pre-lter.
■Coconut Granular Activated Carbon.
■KDF® 55 Catalytic Filtration Media.
■Schungite Natural Mineral.
■Ultraltration Hollow Fiber Membrane.

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Specication
Operating Requirements:
■Minimum supply water pressure: 20 psi (0.14 MPa).
■Maximum supply water pressure: 116 psi (0.8 MPa).
■Minimum water temperature: 41ºF (5ºC).
■Optimal water temperature: 59-77 ºF (15-25ºC).
■Maximum water temperature: 95ºF (35ºC) / up to 105ºF (40.5ºC) short-term.
■Ambient air temperature: 41–105ºF (5-40.5ºC).
■Water source: tap water supply, chlorinated or non-chlorinated, bacteriologically safe.
■Supply water pH range: 4.0-11.0.
■Supply water turbidity: < 1 NTU.
■Recommended ltered water production rate: 34-68  oz/min. (1-2 l/min.).
■Indoor use only.
■Tubing: ¼”.
Weight and Size:
Size (WDH), excluding protrusions: 13.46 x 3.35 x 14.80” (342 x 85 x 376 mm).
Weight, without water and tubing: 7.5 lbs (3.4 kg).
Warranty:
1 year worldwide limited warranty (+ local regulations if applicable).
Package Contents:
(1) Multi-stage ltration unit with installed lters
(1) Universal worldwide adapter ball valve (G1/2” - G3/8” - UNEF 9/16”-24 - JG 1/4”)
(1) Teon tape roll
(1) Faucet
(1) Wrench
(13 / 4 m) Water tubing ¼”
User’s guide

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Installation
Notes:
1. Shut o the cold water supply under the sink or the location where the system will be installed. If
the existing valve is inoperable, the water supply to the house must be shut o. Then, relieve the
water pressure by opening the cold water tap. Do not connect the system to hot water source.
2. Depending on your plumbing system and sink/countertop type you may need to use tools
like variable speed drill, drill bits, screw driver, wrench, etc. You may want to ask a profes-
sional service provider such as sertied plumber to install the inlet valve adapter, faucet,
and drain saddle to assure a trouble-free setup.
3. During installation you will need to cut the supplied ¼” tubing into segments as needed.
Use your utility knife for that or similar tool. See the following charts to determine the
connection scheme and length of hoses necessary. You may need to purchase extra tubing
for far-reaching or other corner case installations.
4. With initial operation, check for leaks. If a leak is observed, ver fy that the tubing is pushed into the
quick tting far enough to seal the tubing against the O-ring and that the tubing was cut at 90°.
filtration unit inlet
faucet outlet
adapter
ball
valve
filtered
water
faucet
General Connection Chart

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To Connect the Tubing to a Fitting:
1. Remove the lock if present (not present
in self-locking ttings).
2. Push. Insert the tube rmly until full stop.
3. Pull the collet back slightly.
4. Replace the lock (if present).
To Disconnect the Tubing:
1. Remove the lock if present (not present
in self-locking ttings).
2. Push the collet and hold.
3. Pull the tubing out.
4. Replace the lock (if present).
IMPORTANT: Cut Tubing At 90º to Ensure a
Watertight Seal:
1
4
3
2
1
4
2
3
No skewed cut!
Placement Guide:
Remember this unit must be serviced at regular intervals. Therefore it should be reasonably
accessible (for changing lters, etc.).

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Installation Steps:
1. Install adapter ball valve (included) to
the cold water supply.
Use some Teon or plumbers sealing tape to
prevent leaks. Use three included threaded
adapters to make dierent connection con-
gurations (see chart for details).
2. Create ½” hole for the ltered water faucet and install it.
Tip: If you have a soap dispenser or a water
sprayer in an existing hole you may remove it
and use its hole for the ltered water faucet.
3. Remove gags and connect tubes as follows. See the General Connection Chart for details.
■Insert water supply tubing from inlet valve adapter into the “inlet”
tting of the ltration unit.
■Insert ltered water tubing from the “faucet” outlet tting of the l-
tration unit into the faucet using insert, sleeve and compression nut.
See faucet installation chart for details.
UNEF 9/16”-24
G3/8” G1/2”
G1/2”
Adapter Adapter
UNEF 9/16”-24
UNEF 9/16”-24
G3/8”
G1/2”
1
Adapter
1
Adapter
2
3
1
23
4
56
7
8
9
10
11
1. Faucet
2. Chrome washer
3. Black rubber washer
4. Countertop or
sink deck
5. Black washer
6. Lock washer
7. Lock nut
8. Insert
9. Sleeve
10. Compression nut
11. Tubing

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Initial Washing:
Aer installation it is recommended to perform the initial washing of the system. For this:
■open cold water supply valve
■open the inlet valve
■open the ltered water faucet
■wait for water to arrive at the faucet (it may take a wile, especially
rst time, water foam and air may be going out of the system); wait for
15-30 minutes for more or less steady ow from the faucet.
■shut o the faucet
■your system is ready for use.
Note: To ensure best ltration you may need to adjust the opening of the inlet valve so that l-
tered water ow from the fully opened faucet would not exceed 34-68  oz/min. (1-2 l/min.).
15-30 min

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Regular Use
To get clean and safe drinking water just open the ltered water faucet.
Tips:
You may install the optional union tee tting to the tubing line prior to the ltered water faucet
to get another line of clean water going to the other point-of-use (such as a sink in a bath-
room or ice maker in your fridge).
Changing Filters
This multi-stage ltration system contains the replaceable components critical to the eciency of
the system. Replacement of component should be with one of identical specications, as dened
by the manufacturer, to assure the same eciency and contaminant reduction performance.
To reduce the risk of water leakage or ooding and to ensure optimal system performance:
■Change the disposable lters every 6-12 months or sooner if you observe a noticeable
reduction in water production rate.
Please note the capacity of the lters is limited. Their service life depends on the degree of
contamination of the water supply and system usage. All terms apply to normal household
use. Actual performance may vary. You may need to change lters sooner than indicated if
you notice chlorine or other tastes or smells, etc.
Replacement Filters:
■K871 (5 µm Sediment Poly Block Pre-Filter)
■K875 (Coconut Granular Activated Carbon Filter)
■K870 (Coconut Carbon Block Pre-Filter)
■K878 (Ultraltration Membrane Element)
Optional lters which can also be used instead of K871 / K875:
■K874 (5 µm Sediment and Coconut Granular Activated Carbon Pre-Filter)
■K872 (Coconut Granular Activated Carbon and KDF®55 Pre-Filter)
■K873 (Granular Activated Carbon with Schungite Natural Mineral Filter)
Note: K875 and K870 may be interchanged and placed third and second respectively.

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To prevent leakage or cracks and ensure the safety of operation and top performance do not
disassemble the lters or try to regenerate them.
To change lters:
■shut-o the inlet valve
■relieve the water pressure by opening the ltered water faucet
■remove the ltration unit from its place for
easier access (disconnect external tubes if
necessary) and open the unit’s cover
■locate the lter to be changed, disconnect
its inlet and outlet ttings and remove it
Note: Remove and change back one lter at
a time, one aer another. Do not remove all
lters at once to avoid mixing up the tubes.

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■take new lter and install it in the place of the removed one observing the water ow direction
arrow on its label and restoring the connections (see the internal connections chart for details)
■close the cover, reconnect the external tubes and place the unit back in its place
Aer you nished changing lters follow the „initial washing” procedure described above.
With initial operation, check for leaks. If a leak is observed, verify that the tube or branch pipe
of the lter housing is pushed into the quick tting far enough to seal the tube against the
O-ring and that the tubing was cut at 90º.
Filtration Unit Internal Connections Chart
inlet
to the faucet

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Prio, Prio logo are the trademarks of DWT Deutsche Wassertechnologien GmbH, Germany.
As used herein, ® denotes registered trademark status in Germany only.
Copyright © DWT Deutsche Wassertechnologien GmbH, Germany, 2014, 2019. Rev. 0719.