Astral Pool Silkflow Waterfall User manual

Silkflow and Cascade
Waterfalls
H0712600_RevA
INSTALLATION MANUAL
FOR YOUR SAFETY - This product must be installed and serviced by a trained Swimming Pool Technician in
accordance with the latest applicable version of AS/NZS 3000, along with any other applicable local and national
installation codes/standards”, and any other local applicable regulations. Before installing this product, read and
follow all warning notices and instructions that accompany this product. Failure to follow warning notices and
instructions may result in property damage, personal injury, or death. Improper installation and/or operation
will void the warranty.
Improper installation and/or operation can create unwanted electrical hazard which can cause serious injury,
property damage, or death.
WARNING
(all models)

3
silkflow and cascade waterfalls Installation Manual
2
silkflow and cascade waterfalls Installation Manual
EQUIPMENT INFORMATION RECORD
DATE OF INSTALLATION
INSTALLER INFORMATION
INITIAL PRESSURE GAUGE READING
WITH CLEAN FILTER
PUMP MODEL
HORSEPOWER
FILTER MODEL
CONTROL PANEL MODEL
SERIAL NUMBER
NOTES

3
silkflow and cascade waterfalls Installation Manual
2
silkflow and cascade waterfalls Installation Manual
Table of Contents
Section 1. Important Safety Instructions ...........4
Section 2. General Installation Requirements..8
2.1 Preparation Instructions ........................................................8
2.2 Excavation and Steel Modifications...................................8
2.3 Concrete Installation and Modifications..........................8
Section 3. Pump Sizing and Installation
Options ....................................................11
3.1 Pump Selection...................................................................... 11
3.2 Existing Pool Filter Pump Installation ............................ 12
3.3 Separate Pump for the AstralPool Silkflow or
Cascade Waterfall.................................................................. 12
Section 4. Plumbing the AstralPool Silkflow
or Cascade Waterfall ...........................13
4.1 Waterfall Return Line Plumbing....................................... 13
4.2 Plumbing a Single Waterfall .............................................. 13
4.3 Plumbing Multiple Units..................................................... 14
4.4 Installing the AstralPool Silkflow or Cascade
Waterfall ................................................................................... 14
4.5 Installing the AstralPool Silkflow or Cascade
Extended Lip Waterfall ........................................................ 14
4.6 Cutting the Lip for Curves or Custom Installations... 15
4.7 AstralPool Silkflow or Cascade Waterfall Radius
Cut Guideline.......................................................................... 16
4.8 Rock Trap Installation Instructions
(Optional Accessory)............................................................ 16
Section 5. Start Up....................................................17
5.1 Start Up Instructions ............................................................ 17
Section 6. General Maintenance and
Troubleshooting...................................18
6.1 Troubleshooting.................................................................... 18
6.2 Freeze Protection and Winterizing.................................. 18
Section 7. Parts List and Views.............................19
7.1 Parts List.................................................................................... 19
7.2 Back Entry Waterfalls ........................................................... 20
7.3 Bottom Entry Waterfalls...................................................... 21

5
silkflow and cascade waterfalls Installation Manual
4
silkflow and cascade waterfalls Installation Manual
Section 1. Important Safety Instructions
READ AND FOLLOW ALL INSTRUCTIONS
All electrical work must be performed by a licensed electrician and conform to all national, state, and local
codes. When installing and using this electrical equipment, basic safety precautions should always be followed,
including the following:
WARNING
To reduce the risk of injury, do not permit children to use this product.
WARNING
RISK OF SUCTION ENTRAPMENT HAZARD, WHICH, IF NOT AVOIDED, CAN RESULT IN SERIOUS
INJURY OR DEATH. Do not block pump suction, as this can cause severe injury or death. Suction
outlet (drain) covers must be certied to the latest published edition of ANSI/ASME A112.19.8 or it’s
successor standard ANSI/APSP-16. In Australia AS1926.3 is also an acceptable standard.
WARNING
To reduce the risk of property damage or injury, do not attempt to change the backwash (multiport, slide,
or full ow) valve position with the pump running.
WARNING
Incorrectly installed equipment may fail, causing severe injury or property damage.
WARNING
• Do not connect system to an unregulated city water system or other external source of pressurized
water producing pressures greater than 250 KPA (35 PSI).
• Trapped air in the system can cause the pump and/or lter lid to be blown off, which can result in
death, serious personal injury, or property damage. Be sure all air is out of the system before operating.
WARNING
Due to the potential risk of re, electric shock, or injuries to persons, AstralPool Equipment must be
installed in accordance with the National Electrical Code® (NEC®), all local electrical and safety codes,
and the Occupational Safety and Health Act (OSHA). Copies of the National Electrical Code may be
ordered from the National Fire Protection Association® (NFPA®) online at www.nfpa.org or call 617-770-
3000, or contact your local government inspection agency.

5
silkflow and cascade waterfalls Installation Manual
4
silkflow and cascade waterfalls Installation Manual
SAVE THESE INSTRUCTIONS
WARNING
Chemical spills and fumes can weaken pool/spa equipment. Corrosion can cause lters and other
equipment to fail, resulting in severe injury or property damage. Do not store pool chemicals near your
equipment.
WARNING
To minimize risk of severe injury or death, the lter and/or pump should not be subjected to the piping
system pressurization test.
Local codes may require the pool piping system to be subjected to a pressure test. These requirements
are generally not intended to apply to the pool equipment, such as lters or pumps.
AstralPool pool equipment is pressure tested at the factory.
If, however, the WARNING cannot be followed and pressure testing of the piping system must include
the lter and/or pump, BE SURE TO COMPLY WITH THE FOLLOWING SAFETY INSTRUCTIONS:
• Check all clamps, bolts, lids, lock rings, and system accessories to ensure they are properly installed
and secured before testing.
• RELEASE ALL AIR in the system before testing.
• Water pressure for test must NOT EXCEED 250 KPA (35 PSI).
• Water temperature for test must NOT EXCEED 38°C (100°F).
• Limit test to 24 hours. After test, visually check system to be sure it is ready for operation.
Notice: These parameters apply to AstralPool equipment only. For non-AstralPool equipment, consult
the equipment manufacturer.

7
silkflow and cascade waterfalls Installation Manual
6
silkflow and cascade waterfalls Installation Manual
WARNING
SUCTION HAZARD. Can cause serious injury or death. Do not use this pump for wading pools,
shallow pools, or spas containing bottom drains, unless pump is connected to at least two (2)
functioning suction outlets.
WARNING
Pump suction is hazardous and can trap and drown or disembowel bathers. Do not use or
operate swimming pools, spas, or hot tubs if a suction outlet cover is missing, broken, or loose.
The following guidelines provide information for pump installation that minimizes risk of injury to users of
pools, spas, and hot tubs:
Entrapment Protection - The pump suction system must provide protection against the hazards of
suction entrapment.
Suction Outlet Covers - All suction outlets must have correctly installed, screw-fastened covers in
place. All suction outlet (drain) covers must be properly maintained. They must be replaced if cracked,
broken, or missing. Drain covers must be listed/certied to the latest published edition of ANSI®/ASME®
A112.19.8 or its successor standard, ANSI/APSP-16. In Australia, AS1926.3 is also an acceptable
standard. The pool must be shut down and bathers must be restricted from entering the pool until any
cracked, broken, or missing drain covers are replaced.
Number of Suction Outlets Per Pump - Provide at least two (2) hydraulically-balanced suction outlets,
with covers, as suction outlets for each circulating pump suction line. The centers of the suction outlets
(suction outlets) on any one (1) suction line must be at least three (3) feet apart, centre to centre. See
Figure 1.
The system must be built to include at least two (2) suction outlets (drains) connected to the pump
whenever the pump is running. However, if two (2) suction outlets run into a single suction line, the
single suction line may be equipped with a valve that will shut off both suction outlets from the pump.
The system shall be constructed such that it shall not allow for separate or independent shutoff or
isolation of each drain. See Figure 1.
Additional pumps can be connected to a single suction line as long as the requirements above are met.
Water Velocity - The maximum water velocity through the suction outlet assembly and its cover for any
suction outlet must not exceed the suction outlet assembly and its cover’s maximum design ow rate.
The suction outlet (drain) assembly and its cover must comply with the latest version of ANSI®/ASME®
A112.19.8, the standard for Suction Fittings For Use in Swimming Pools, Wading Pools, Spas,and Hot
Tubs, or its successor standard, ANSI/ASME APSP-16. In Australia, AS1926.3 is also an acceptable
standard.
Testing and Certication - Suction outlet covers must have been tested by a nationally recognized
testing laboratory and found to comply with the latest published edition of ANSI/ASME A112.19.8 or
its successor standard, ANSI/APSP-16, the standard for Suction Fittings For Use in Swimming pools,
Wading Pools, Spas, and Hot Tubs. In Australia, AS1926.3 is also an acceptable standard.
Fittings - Fittings restrict ow; for best efciency use fewest possible ttings (but at least two (2) suction
outlets).
Avoid ttings that could cause an air trap.
Pool cleaner suction ttings must conform to applicable International Association of Plumbing and
Mechanical Ofcials (IAPMO) standards.

7
silkflow and cascade waterfalls Installation Manual
6
silkflow and cascade waterfalls Installation Manual
Listed/certified to the latest
published version of
ANSI/ASME A112.19.8 or
its successor standard,
ANSI/APSP-16.
Anti-entrapment
Cover/Grate or Suction
Fitting, securely-fastened
to Main Drain Sump
Listed/certified to the latest
published version of
ANSI®/ASME®A112.19.8 or
its successor standard,
ANSI/APSP-16.
Anti-entrapment
Cover/Grate or Suction
Fitting, securely fastened to
Main Drain Sump
At Least
3 Feet
Suction Outlet
(Main Drain)
Suction Outlet
(Main Drain)
Valves permitted only after tee Pump
No valves between
Tee and Main Drains
Skimmer
Figure 1. Number of Suction Outlets Per Pump

9
Silkflow and Cascade waterfalls Installation Manual
8
Silk flow and Cascade Waterfalls Installation Manual
Section 2. General Installation
Requirements
This document gives instructions for installing the
AstralPool Silkflow and Cascade Waterfalls. Read
through the instructions completely before starting
the procedure.
2.1 Preparation Instructions
WARNING
To avoid risk of property damage, do not leave un-
installed waterfall in direct sunlight.
Do not remove the plastic protection or protective
tape until the waterfall is ready for use. Keep
the protective red tape placed over the waterfall
lip opening to protect from grout and dirt during
installation.
During all phases of the installation, care should
be taken not to damage the AstralPool Silkflow
and Cascade Waterfall. Keep the unit in the original
packaging until the site is prepared for permanent
installation.
The AstralPool Silkflow and Cascade Waterfalls are
available in standard sizes from 300mm to 2400mm in
length and are shipped complete with protective tape
or tongue installed on the opening of the waterfall.
See Figure 2. This protection keeps the spillway
opening clean and damage free. DO NOT REMOVE THE
PROTECTIVE TAPE OR TONGUE until the startup of the
pool equipment. The protective tape must be left on
the opening during the entire installation, or damage
to the unit, which would effect its ability to perform,
may occur.
To properly install this product please review the
following installation and maintenance instructions.
6” Lip Back Entry Cascade Waterfall
1” Lip Back Entry Silkow Waterfall
Protective
Cap
Protective
Tape
Protective
Tongue
Protective
Cap
Figure 2. AstralPool Waterfalls
2.2 Excavation and Steel Modifications
It is recommended that the area designated for the
AstralPool Silkflow or Cascade Waterfall be marked
off with colored stakes, yellow construction ribbon, or
similar material during the framing process, prior to
excavation.
In preparation for the installation of the steel rebar,
mark the EXACT area designated for the Silkflow or
Cascade Waterfall. To allow room for notching the
bond beam and installing the unit, offset the steel
pattern by 76mm below the original form and 25mm
on both ends of the AstralPool Silkflow or Cascade
Waterfall. For example, if the AstralPool Silkflow or
Cascade Waterfalls are 1200mm in length, offset the
steel pattern to measure 76mm down from the top of
the frame and 1270mm in length (this allows 25mm
of space on each side of the Astral Pool Silkflow or
Cascade unit). See Figure 3.
89mm W x 89mm D
Notch
Finished Notch In Beam
Steel O Set
Top Of Raised
Bond Beam
Note: Notching of the bond beam is the next step
in the process. The change to the steel will
make the notch a simple procedure.
64mm
Figure 3. Excavation and Steel Installation
2.3 Concrete Installation and Modifications
As the concrete installation (or similar process) nears
completion, a notch must be cut into the inner edge
of bond beam in the same area at which the steel was
offset to allow for the installation of the AstralPool
Silkflow or Cascade Waterfall. See Figure 4.
89mm W x 89mm D Notch
Tile
64mm
89mm
Figure 4. Concrete Installation

9
Silkflow and Cascade waterfalls Installation Manual
8
Silk flow and Cascade Waterfalls Installation Manual
When installing waterfalls in a sprayed concrete or
brick walls, do not tie the waterfall to the Reinforcing
Steel or spray in the concrete as they can distort and
cause internal damage due to excessive stressing and
movement. Provide a penetration using polystyrene
or wood, allowing for connection of the pipe work at
the rear. The Waterfall can then be installed at a later
date once the wall has set.
2.3.1 Cutting the Bond Beam - For AstralPool
Silkflow or Cascade Waterfall Sizes
300mm through 1200mm
Select the EXACT location for the AstralPool Silk-
ow or Cascade Waterfall. The notch in the bond beam
should be cut 89mm D x 64mm W and 51mm longer
than the length of the proposed AstralPool Silkow or
Cascade Waterfall (25mm per side). For example, if
a 1200mm model is to be installed, the notch length
should be 1270mm(1219mm + 25mm + 25mm =
1270mm). In addition, mark a single slot on the top of
the beam in the center of the proposed notch 89mm W
x 89mm D. The notch will be used to plumb 38mm pipe
to the AstralPool Silkow or Cascade Waterfall. Mark
the bond beam and proceed with cutting the beam. See
Table 1 and Figure 5.
Length Plumbing Center Measurement
300mm 150mm
600mm 300mm
900mm 450mm
1200mm 600mm
Table 1. Waterfall Plumbing Center Measurement- Single Inlet
Rock Trap
Notch In Beam Beam
Back Entry Plumbing For
300mm Through 1200mm Units
A
Center
A Length
300mm = 150mm
600mm = 300mm
900mm = 450mm
1200mm = 600mm
Figure 5. Plumbing for 300mm through 1200mm Lengths
2.3.2 Cutting the Bond Beam - For AstralPool
Silkflow or Cascade Waterfall Sizes
1800mm and 2400mm
Mark and cut the beam as instructed previously, with
the exception that two notches are required on the
top of the beam for piping. Longer waterfalls require
more water; consequently, two plumbing lines are
required. The top of the beam should be marked for
these units as noted in Figure 6 and Table 2.
Length Plumbing Center Measurement
1800mm 450mm from right and left edge
2400mm 600mm from right and left edge
Table 2. Waterfall Plumbing Center Measurement- Dual Inlet
NOTE These measurements are from the center of the
AstralPool Silkow or Cascade Waterfall unit.
The notches should be 89mm W x 89mm D. See
Figure 6.
Manifold
Rock Trap
Back Entry Plumbing For
1800mm and 2400mm Length
Beam
Center
A A
A Length
1800mm = 450mm
2400mm = 600mm
Figure 6. Plumbing for 1800mm and 2400mm Lengths
2.3.3 Pool Wall Lintels
WARNING
To avoid risk of property damage, install a lintel for
support of the extended lip of the waterfall. Any direct
weight applied to the waterfall brick work /concrete
without using lintels will result in warranty being
made void.
Waterfalls are not designed to lift heavy weights. A
lintel is needed to properly support the waterfall to
ensure the overall performance of the waterfall. See
Figures 7 and 8.

11
Silkflow and Cascade waterfalls Installation Manual
10
Silk flow and Cascade Waterfalls Installation Manual
Steel Lintel
Inlet
Pool
Wall
Waterfall
Figure 7. Lintel Installation for 1” Lip Back Entry Waterfall
Steel Lintel
Pipe Work
Brick/Limestone
Wall
Tiles
Tile Adhesive
Ensure
Waterfall
Trough
is level when
installing
Water Line
Bond Beam
Figure 8. Lintel Installation for 6” Lip Bottom Entry
Waterfall

11
Silkflow and Cascade waterfalls Installation Manual
10
Silk flow and Cascade Waterfalls Installation Manual
Section 3. Pump Sizing and
Installation Options
NOTE Make sure the cuts in the beam are properly
completed before proceeding.
One of the advantages of the AstralPool Silkflow
and Cascade Waterfalls is the ability to provide a
continuous sheet of water with a minimum of water
flow. A standard 1200mm model, for example,
requires only 151 litres per minute to operate. In
order to size your pump properly, refer to the Water
Flow Requirement Chart. In most cases, a properly
sized standard swimming pool pump will operate
the AstralPool Silkflow or Cascade Waterfall and filter
the pool with little loss of total water turnover. As
a general rule of thumb, the AstralPool Silkflow or
Cascade waterfall requires approximately 4 litres per
minute per mm with little head loss. Refer to Figure 10
and Tables 3 and 4.
NOTE When plumbing multiple falls, add the total length
of waterfalls together to determine litres required.
e.g. When plumbing two (2) 2400mm units, you
now have 2400mm of waterfall, which requires 454
litres per minute.
D
C
A
B
Waterfall
Figure 9. Waterfall Measurements for 300mm to 2400mm
Models
Length
(A)
Entry
Width (B)
Height
(C)
Distance
(D)
Waterflow
300mm 200mm 300mm 300mm 50 lpm
600mm 500mm 600mm 300mm 100 lpm
900mm 800mm 900mm 300mm 150 lpm
1200mm 1100mm 900mm 300mm 200 lpm
1800mm 1700mm 900mm 300mm 300 lpm
2400mm 2300mm 900mm 300mm 400 lpm
Table 3. AstralPool Silkflow Waterflow Requirements
Length
(A)
Entry
Width (B)
Height
(C)
Distance
(D)
Waterflow
300mm 200mm 300mm 300mm 25 lpm
600mm 500mm 600mm 300mm 50 lpm
900mm 800mm 900mm 300mm 75 lpm
1200mm 1100mm 900mm 300mm 100 lpm
1800mm 1700mm 900mm 300mm 150 lpm
2400mm 2300mm 900mm 300mm 200 lpm
Table 4. AstralPool Cascade Waterflow Requirements
3.1 Pump Selection
NOTE If installing multiple waterfalls, select the
appropriate pump to power the total water ow
capacity. For example, two (2) 1200mm Silkow
Waterfalls equate to a 2400mm waterfall requiring
a total water ow capacity of 400 litres per minute.
See Tables 5 or 6 for the appropriate pump
selection for a Silkow or Cascade Waterfall.
Length Required
Water Flow
(lpm)
Typical
Pump Size
(HP)
AstralPool
Pump
(8m Head)
300mm 50 0.50 E140
600mm 100 0.50 E170
900mm 150 0.75 E230
1200mm 300 0.75 CTX280
1800mm 300 1.50 CTX360
2400mm 400 2.00 CTX500
Table 5. AstralPool Silkflow Waterfall Pump Selection
Length Required
Water Flow
(lpm)
Typical
Pump Size
(HP)
AstralPool
Pump
(8m Head)
300mm 25 0.50 E140
600mm 50 0.50 E170
900mm 75 0.50 E140
1200mm 100 0.50 E170
1800mm 150 0.75 E230
2400mm 200 0.75 CTX280
Table 6. AstralPool Cascade Waterfall Pump Selection

13
Silkflow and Cascade waterfalls Installation Manual
12
Silk flow and Cascade Waterfalls Installation Manual
3.2 Existing Pool Filter Pump Installation
The installation of the AstralPool Silkflow or Cascade
Waterfall using the main pool filter pump is the most
common plumbing system, due to the unique low
flow aspect of the waterfall system. Simply plumb a
three way valve on the return line, after the filter, and
plumb the waterfall feed line in a minimum of 40mm
PVC Schedule 40 pipe. Units above 1800mm in length
need a minimum of 50mm plumbing.
3.3 Separate Pump for the AstralPool
Silkflow or Cascade Waterfall
If multiple waterfalls are being installed, or a
AstralPool Silkflow or Cascade Waterfall 1800mm or
longer is being installed, we recommend installing a
separate pump. When plumbing a pump dedicated
for use by the waterfall, a separate suction line to the
pool must be plumbed. This should be plumbed in a
minimum of 50mm Schedule 40 pipe.
WARNING
For safety, at least two certied ANSI/APSP-16
‘VGB’ compliant suction outlets must be installed.
It is recommended that they be 457mm above
the pool oor and must be at least 914mm apart
with no valves between the “Tee” and any of the
suction covers.
Next, a AstralPool Silkflow or Cascade filter/strainer
(Part #10060), or equivalent, must be installed on the
return side of the pump, between the pump and the
AstralPool Silkflow or Cascade Waterfall. A FILTER IS
REQUIRED for separate pump installations, as large
debris must not be allowed to enter the Silkflow
and Cascade unit. For installations requiring up to
227 litres per minute, use one AstralPool Silkflow or
Cascade filter. For higher water requirements, use two
or more filters plumbed in parallel.
A separate return line, with a three way valve plumbed
in such a way that water can be balanced between
the AstralPool Silkflow or Cascade Waterfall and return
back to the pool, is also required. See Figure 11.
Anti Vortex
Cover
Suction Line
Separate Return
to Pool
Valve
Filter/Strainer
Filter
Pump
Rock Trap
Water Line
Waterfall Unit
Conventional
Concrete Decking
Tile
Cantilever Edge
Lintel
Figure 10. Filter Pump Installation

13
Silkflow and Cascade waterfalls Installation Manual
12
Silk flow and Cascade Waterfalls Installation Manual
Section 4. Plumbing the AstralPool
Silkow or Cascade Waterfall
A dedicated plumbing line is recommended for all
waterfalls. Waterfalls up to 900mm can use 40mm PVC
pipe, but it is recommended that 50mm PVC pipe be
used for all installations and must be used where the
required flow rate exceeds 200 ltr/min or the total
pipe length exceeds 20 metres. The waterfall must
be installed before the deck and coping are layed to
cover the Waterfall.
4.1 Waterfall Return Line Plumbing
The waterfall feed line, from either the main filter
pump or a separate pump, should be plumbed with a
pipe size capable of handling the required flow rate of
the waterfall. See Table 7.
NOTE 50mm plumbing or larger is suggested for
waterfalls over 1800m in total length. Refer
to Hydraulic Guideline Chart, Table 7, for
specications. The feed line should end near the
back of the bond beam near the center of the
waterfall location.
It is important to have a valve located in a convenient
location on the feed line to regulate the flow of water
to the AstralPool Silkflow or Cascade Waterfall. A
three-way valve is suggested to be used as the “T”
from the return line of the pool to the AstralPool
Silkflow or Cascade Waterfall. A properly plumbed
valve in that position will allow full control of the
water to the waterfall, as well as to the rest of the pool.
In most cases, this valve can be located after the filter
near the equipment pad. See Figure 12.
NOTE All water to the AstralPool Silkow or Cascade
must be ltered. Those systems using a separate
pump must use our separate energy lter (Part
#10060) to prevent debris from entering the
AstralPool Silkow or Cascade unit.
Minimum Recommended Pipe Size
(Max Suction = 6ft/sec; Min Discharge side = 10 ft/sec)
AstralPool
Silkow /
Cascade Size
Flow (Q)
lpm
Suction Side
Pipe
Discharge
Side Pipe
300mm 50 / 25 40mm 40mm
600mm 100 / 50 40mm 40mm
900mm 150 / 75 40mm 40mm
1200mm 200 / 100 50mm 40mm
1800mm 300 / 150 50mm 50mm
2400mm 400 / 200 50mm 50mm
Table 7. Hydraulic Guideline Chart
Suction
from Pool
Water to
Waterfall Pump
Three-way
Valve
Rock
Trap
Filter
Line Bypass to Pool
Figure 11. Waterfall Return Line Plumbing
4.2 Plumbing a Single Waterfall
All Back Entry AstralPool Silkflow or Cascade
Waterfalls have the equivalent of standard 40mm pipe
protruding from the back of the unit. For waterfalls
300mm through 1200mm in length, this fitting is
located in the center of the back of the waterfall.
For AstralPool Silkflow or Cascade waterfalls 1800mm
or 2400mm in length, two 50mm fittings are located
as shown in Table 1.
Standard 40mm PVC fittings will glue over the 40mm
pipe provided on all AstralPool Silkflow or Cascade
Waterfalls. Make sure the fittings are properly glued.
Also, make sure the Rock Trap is properly installed
as close to the waterfall as possible (Figure 12). See
Section 4.8 for Rock Trap installation instructions.
NOTE A ow control valve must be plumbed in a
convenient location on the supply line for
regulation of the water supply to the unit. See
Figures 13 and 14.
Rock Trap
Notch In Beam Beam
Back Entry Plumbing For
300mm Through 1200mm Units
Ensure Plumbing Lines To Unit Are Clear Of Debris.
Ensure Plumbing Is Properly Sized.
Figure 12. Single Waterfall Plumbing for 300mm to
1200mm

15
Silkflow and Cascade waterfalls Installation Manual
14
Silk flow and Cascade Waterfalls Installation Manual
Manifold
Rock Trap
Back Entry Plumbing For
1800mm and 2400mm Units
Beam
Ensure Plumbing Lines To Unit Are Clear Of Debris.
Ensure Plumbing Is Properly Sized.
Figure 13. Single Waterfall Plumbing for 1800mm and
2400mm
4.3 Plumbing Multiple Units
Plumbing two or more AstralPool Silkflow or Cascade
Waterfalls together is done in exactly the same way as
the installation procedure for a single unit, explained
previously, with the exception that additional two-
way valves are required for each AstralPool Silkflow or
Cascade Waterfall. These valves regulate and balance
the amount of water between the various waterfalls.
For units 1800mm and 2400mm long, separate
minimum 50mm lines are required, with valves to
regulate the balance. See to Figure 15.
Waterfall Back Entry Plumbing
For 300mm to 1200mm Units
Make Sure No Debris Is In Any Of
The Plumbing Lines In The Unit
Rock Trap
Valve
Waterfall Back Entry Plumbing For
1800mm and 2400mm Units
Rock Trap
Valve
Figure 14. Multiple Waterfall Plumbing
4.4 Installing the AstralPool Silkflow or
Cascade Waterfall
The AstralPool Silkflow or Cascade Waterfall is
generally installed by the tile installer.
NOTE The AstralPool Silkow or Cascade Waterfall must
be installed prior to installing the decks and coping.
Place the AstralPool Silkow or Cascade Waterfall
in the pre-cut notch in the bond beam. Level the
top of the AstralPool Silkow or Cascade unit to the
upper edge of the bond beam with tile shims.
Spillway
Water Line
Tile
Spillway Must Be
Flush With Tile Or
Overhang By 1/8"
Undercoat Or Browncoat
Then Thin Set And Tile
Lintel
Waterfall
(side view)
Figure 15. Waterfall Installation
NOTE The top of the AstralPool Silkow or Cascade
Waterfall is where the opening and tongue are
located. Fill the gaps around the unit with concrete
brown coat, or similar material, and surface the
face of the AstralPool Silkow or Cascade unit
in preparation for tile. The face of the AstralPool
Silkow or Cascade Waterfall has been designed
to allow concrete to “grip” the surface and assure
a strong tile bond. Cut the tile to t under the “lip”
of the unit and secure with“thin set” or similar
compound. See Figure 16.
4.5 Installing the AstralPool Silkflow or
Cascade Extended Lip Waterfall
The AstralPool Silkflow or Cascade Extended Lip
Waterfalls are used for radius cuts or when the lip of
the waterfall needs to extend over wide objects such
as brick, glass block, etc. The lip extension is 6” (the
standard AstralPool Silkflow or Cascade Waterfall has
a one inch lip). Operation and installation of both
products is identical, with the exception that the steel
pattern and notch in the beam may need to be altered
to accommodate the lip width.
NOTE The extended lip must be fully supported. See
Figure 17.

15
Silkflow and Cascade waterfalls Installation Manual
14
Silk flow and Cascade Waterfalls Installation Manual
6” Lip Waterfall
Over Brick/Rock Installation
Brick
Brick
Brick
Bond beam
Over the Beam Installation
Bond beam
Tile
Notch
back of
beam
Rock Trap
Lintel
Figure 16. Extended Lip Waterfall Installation
Mortar will not stick to the plastic parts on the
AstralPool Silkflow or Cascade Waterfall. When using
various types of coping material, consult with your
decking contractor for appropriate installation and or
modification to the installation.
NOTE The tongue must stay in place during entire
installation, but make sure it is removed prior to
system start up. All aspects of the installation are
the same as the standard model AstralPool Silkow
or Cascade Waterfall.
4.6 Cutting the Lip for Curves or Custom
Installations
The 6”Lip AstralPool Silkflow or Cascade Waterfall can
be custom cut in the field to meet specific needs, such
as curves, irregular shapes, etc. In order to custom
fit the waterfall, carefully measure the amount of
extended lip to be removed. Remember to leave
enough room for tile and thin set, so the deepest edge
of the radius cut will not be recessed from the tile line.
NOTE Never remove more than 4” of the extended lip,
leaving a minimum of 2”of lip. See Figures 18 and
19.
Remove the protective tape or tongue prior to cutting
the waterfall. Remember to REPLACE THE PROTECTIVE
TAPE OR TONGUE after cutting the radius to protect
the fall from construction debris.
The waterfall must be cut with a coarse tooth saw
blade. Running water can be applied to the surface
being cut to keep the blade cool. Caution must be
taken to make the cut as smooth as possible to avoid a
jagged edge.
After cutting the waterfall, insert the support removal
tool (included in product packaging) 1 inch into the
waterfall opening. Move the tool around the opening.
If the tool hits a support, use the notch in the tool to
remove the support. See Figures 18 and 19. Make sure
all supports within 1 inch of lip opening are removed.
DO NOT LEAVE THE LOOSE SUPPORT SECTION IN THE
WATERFALL.
Convex Curve
Break o lip supports
1" from lip of waterfall Support
removal tool
Keep Red Protective Tape During Installation
Convex Curve
Figure 17. Custom Waterfall Installation - Convex Curve
Concave Curve
2" minimum
Break o lip supports
1" from lip of waterfall
Support
removal tool
Keep Red Protective Tape During Installation
Concave Curve with Tongue
6"
¾"
¼"
½"
Figure 18. Custom Waterfall Installation - Concave Curve

17
Silkflow and Cascade waterfalls Installation Manual
16
Silk flow and Cascade Waterfalls Installation Manual
After removing sections of the supports, use a coarse
grade of sandpaper to smooth the edges of the
waterfall, follow with a fine grade of sandpaper to
get the edge as smooth as possible. A sanding block
is recommended to avoid rounding the edges of the
waterfall.
Insert the protective tape onto the lip (or protective
tongue into the lip) and continue installation,
following the installation instructions for the standard
AstralPool Silkflow or Cascade Waterfall.
NOTE Ensure the protective tape or tongue completely
covers the lip opening so no debris can enter the
spillway opening.
4.7 AstralPool Silkflow or Cascade Waterfall
Radius Cut Guideline
NOTE Never remove more than 4” of the extended lip,
leaving a minimum of 2”of lip. The top of the beam,
where the AstralPool Silkow or Cascade unit is to
be installed, should be a minimum of 9”thick. When
designing custom curves for the AstralPool Silkow
or Cascade 6”Lip models, please refer to Section 4.6
for further instructions. Refer to Figure 20.
Waterfall with
6” lip radius installation
Do not
remove more
than 4"
Figure 19. 6” Lip Radius Installation
4.8 Rock Trap Installation Instructions
1. Install the Rock Trap as close to the water xture
(waterfall, jets, etc.) as possible, to assure maximum
protection.
2. Rock Trap must be installed with debris collection
chamber pointed DOWN. See Figure 21.
3. Prior to gluing the Rock Trap, ensure ow arrow is
properly aligned.
4. NEVER install Rock Trap where debris chamber cannot
be pointed DOWN. Refer to Figure 22.
From pump To Waterfall
Screen
Debris
trap
Figure 20. Rock Trap Installation
Rock trap
Right
Wrong
Figure 21. Rock Trap Debris Chamber Installation

17
Silkflow and Cascade waterfalls Installation Manual
16
Silk flow and Cascade Waterfalls Installation Manual
Section 5. Start Up
5.1 Start Up Instructions
After the swimming pool is completed and filled with
water, the AstralPool Silkflow or Cascade Waterfalls are
ready to be activated.
1. REMOVE THE PROTECTIVE TAPE OR TONGUE NOW. This
must be done before water is diverted to the waterfall.
Also, ensure the opening is clean and clear of any
debris.
2. Turn the pump on. If the Waterfalls are plumbed with
the main pool lter pump, allow the pump to run a
few minutes to clear the lines of debris.
3. Slowly open the regulating valve and supply water to
the AstralPool Silkow or Cascade Unit. Adjust the ow
of water until the sheet of water extends out onto the
pool surface.
4. Allow for air to clear the lines. This should only take
a few minutes. The AstralPool Silkow or Cascade
Waterfall unit should now provide a clear, continuous
sheet of water.
5. If a separate pump was installed, make sure all valves
are open prior to starting the pump. ENSURE ALL
LINES ARE CLEAR OF DEBRIS BEFORE STARTING. Start
the pump and allow water to circulate through the
separate lter system and return line. Slowly open
the valve to the waterfall and regulate to the desired
setting. Allow a few minutes to purge all air from the
lines.

19
Silkflow and Cascade waterfalls Installation Manual
18
Silk flow and Cascade Waterfalls Installation Manual
Section 6. General Maintenance and Troubleshooting
Before proceeding, make sure the pump system is fully functional and activated. Also, ensure all air is purged from
plumbing lines.
6.1 Troubleshooting
Problem Cause Solution
The Silkow and Cascade
Waterfalls are not completely
smooth. A gap in the sheet of the
water is present.
Debris in the plumbing has
lodged in the opening of the
waterfall.
Use a credit card or similar object and gently position it inside the
opening while the waterfall is on. Slide it along the opening to the
point where the debris is located and gently pull the debris through the
opening.
Where multiple Silkow and
Cascade Waterfalls are installed,
one of the waterfalls is stronger
than the other.
The water supplied to
the units is not properly
balanced.
Adjust the valves for each waterfall until the proper effect and balance
is achieved. See Figure 14 for valve location.
6.2 Freeze Protection and Winterizing
In order to prevent freeze damage to the system, the plumbing to the unit must be installed so water drains easily
from the system. The AstralPool Silkflow and Cascade Waterfalls have been engineered to allow only a minimum
of water to stay in the unit as long as the plumbing is installed properly. Blow out all water from the pipes and
AstralPool Silkflow or Cascade unit. Follow the normal procedures for winterizing.

19
Silkflow and Cascade waterfalls Installation Manual
18
Silk flow and Cascade Waterfalls Installation Manual
Section 7. Parts List and Views
7.1 Parts List
Description Size Part
Silkow, 25mm / 1” Lip
300mm 10270
600mm 10271
900mm 10272
1200mm 10273
1800mm 10274
2400mm 10275
Silkow, 150mm / 6” Lip
300mm 10277
600mm 10278
900mm 10279
1200mm 10280
1800mm 10281
2400mm 10282
Cascade, 25mm / 1” Lip
300mm 10283
600mm 10290
900mm 10291
1200mm 10284
1800mm 10285
2400mm 10286
Cascade, 25mm / 1” Lip
Bottom Entry
300mm 10210
600mm 10211
900mm 10212
1200mm 10213
1800mm 10214
2400mm 10215
Silkow, 25mm / 1” Lip
Bottom Entry
300mm 10250
600mm 10251
900mm 10252
1200mm 10253
1800mm 10254
2400mm 10255
Silkow, 150mm / 6” Lip
Bottom Entry
300mm 10257
600mm 10258
900mm 10259
1200mm 10260
1800mm 10261
2400mm 10262

21
Silkflow and Cascade waterfalls Installation Manual
20
Silk flow and Cascade Waterfalls Installation Manual
7.2 Back Entry Waterfalls
260 mm
155 mm
210 mm
16 mm
ø 48.4 mm
130 mm
80 mm
16 mm
ø 50 mm
6” Lip Back Entry Waterfall
1” Lip Back Entry Waterfall