PRODUCT DIMENSIONS
Maelstrom with Shark Cage Filter
RHML02 100mm

Maelstrom withShark Cage Filter

533MM (21")
506MM(19.9”)

158MM (6.2”)

140MM (5.5”)

120MM (4.7”)

392MM (15.4”)

183MM(7.2”)

500MM (19.7")

FRONT VIEW

MOUNT PLATE DIAMETER NOMINAL SIZE 505MM (19.9")
CAN BE TRIMMED TO 414mm (16.3") OR 327mm (12.9")

SIDE VIEW

Shark Cage Filter

0.18mm (180 m) Aperture, SS316

Mosquito Proof Screen

0.955mm (0.04") Aperture, SS316

Inlet & Outlet Pipe Size

DN100 (110mm OD) / 4” OD

Coupling

Flexible, EPDMBody & Base Plate

ABS, Polypropylene

Base Plate

Fits 500mm tank opening, cutto fit 400mm or 300mm tankopening

Installation and Specification Guide

Performance Data
Water Catchment Efficiency @ 5L (1.32gal) / second*

100%

Water Catchment Efficiency @ 10L (2.64gal) / second*

98%*For wet/charged system configuration with clean water flow

ALL DIMENSIONS IN MM UNLESS OTHERWISE STATED.
DISCLAIMER This product specification is not a complete guide to product usage. Further information is available fromRain Harvesting Pty Ltd and from the Installation and Operating Instructions. This specification sheet must be read in conjunction
with the Installation and Operating Instructions and all applicable statutory requirement. Product specifications may change
without notice. © Rain Harvesting Pty Ltd.

+61 (0)7 3248 9600

rainharvesting.com.au

PRODUCT DETAILSFEATURES AND BENEFITS

The Maelstrom with Shark Cage Filter builds on ouroriginal Maelstrom design, with an unmatched water
catchment efficacy.

•A single point, tank-top filter with a groundbreaking stainless steel shark cage design•

The 180 micron filter screens particles 5 times
smaller than is achieved with a standard
tank screen•

Reduces the hassle of cleaning leaf and debrisbuild-up through Self-flushing•

Blocks out light that supports algae growth.

•Is a versatile product, able to be installed in avariety of pre-tank locations•

Reduces frequency and cost of tank cleaning
by lowering common sediment build up throughcleaner tank water•

Mounting plate fits 300mm, 400mm and500mm tank openings, or can be used for
mounting in-tank, on wall or in a pit

The stainless steel Shark Cage Filter provides theultimate solution for blocking leaves and debris,making it nearly impossible for unwanted particles topass through the Shark Cage’s super-fine 180 micron
filtration.
Stringently tested and developed to ensure the absolute
maximum in rainwater capture and leaf rejection, theMaelstrom with Shark Cage Filter offers the same levelof super-fine filtration that the original Maelstrom does,with the added bonus of a significant increase in water
capture, to deliver more water to your rainwater tank.
RHML02100mm

Installation
WHAT’S IN THE BOX?
•Maelstrom filter with Shark Cage

•3 flexible couplings(two on Maelstrom and one in box)

TOOLS/MATERIALS YOU MAY REQUIRE••••••••Screwdriver
6 screws for mounting to your tankUtility knife
Marker pen
Tape measure
Brackets (wall mount or in-tankmount)
Drill and Hole saw (pit mount or intank mount)
600mm/24” stormwater pit(pitmount)

TANK TOP MOUNT
1.

Determine which port on yourMaelstrom’s symmetric U-bend you
want to use for your water inlet andwhich port you want to use for yourwaste outlet. The filter works equallyeffectively in either direction, so assign
each port depending on what’s mostconvenient for your chosen installation
point.

2.

Remove the existing tank screen fromthe opening of your rainwater tank by
unscrewing and pulling it out and off
the tank.

3.

Snap your Maelstrom out of themounting plate.

4.

Turn your Maelstrom’s mounting plate
upside down and, using your removed
tank screen as a guide, trim to thenearest size by cutting in the channel
as indicated. Ensure that once cut, thescrew points on the mounting plate
will still allow you to screw through themounting plate into the top of the tank toprovide a mosquito - proof seal.

HOW IT WORKS

180 micron filter

5.

Centre the mounting plate over your tankinlets and screw it to your tank top.

6.

Remove the 100mm flexible couplingfrom the filtered water outlet (F), or you
may wish to cut away the filtered wateroutlet from your Maelstrom in the cutchannel provided to expand the outlet
size and allow more water to enter
your tank than the standard 100mmoutlet. This is recommended if your rain
harvesting system is designed to harvest
100% of your roof catchment area or if
you’re in an area that experiences highpeak flows during rain events.

7.

Snap your Maelstrom in place throughthe opening in the mounting plate.

Made from Stainless Steel

Maelstrom not included

8.

Loosen the hose clamp on your chosenwater inlet port. Measure and cut yourinlet pipe and connect it so it fits withinyour chosen inlet port, then tighten thehose clamp around it.

9.

Loosen the hose clamp on your chosenwaste outlet port. Where practical, werecommend plumbing the overflow outlet
so that it directs excess water and debris
to stormwater. Alternatively, you cancap your waste outlet with a vented flap
valve.

10. Whichever outlet option you choose,measure and cut your outlet pipe, insert
it in your chosen outlet port, then tighten
the hose clamp around it.

WALL MOUNTIN TANK

1.

Determine which port on yourMaelstrom’s symmetric U-bend you want
to use for your water inlet and which port
you want to use for your waste outlet. The
filter works equally effectively in either
direction, so assign each port dependingon what’s most convenient for yourchosen installation point.

1.

Check that your assembled Maelstrom(including flexible couplings andmounting plate) will fit within your tankriser. There must be enough space toallow the clips on the lid to open andfor the inlet and outlet pipes to beconnected to your Maelstrom.

2.

2.

Select appropriate brackets that can
support your Maelstrom’s mounting
plate.

3.

Install the brackets on your wall sothat they’re positioned to sit 102mm(4”) below your pipework and at least
260mm (10.2”) apart so there’s enoughclearance for your Maelstrom’s filteredwater outlet.

Identify the location of any existing
inlets through the riser and use thisto determine the height at which yourMaelstrom will be positioned. The
filter works equally effectively in either
direction, so depending on what’s mostconvenient for your chosen installation
point, you can assign either port on yourMaelstrom’s symmetric U-bend as thewater inlet or waste outlet.

4.

Snap your Maelstrom out of themounting plate.

5.

Screw the mounting plate to thebrackets, ensuring it is centred.

6.

Snap your Maelstrom in place throughthe opening in the mounting plate.

7.

Loosen the hose clamp on your chosenwater inlet port. Measure and cut yourinlet pipe as required and connect it so
it fits within your Maelstrom’s inlet port,then tighten the hose clamp around it.

8.

Loosen the hose clamp on your chosenwaste outlet port. Where practical, we
recommend plumbing the overflow outlet
so that it directs excess water and debris
to stormwater. Alternatively, you cancap your waste outlet with a vented flap
valve.

9.

Whichever outlet option you choose,measure and cut your outlet pipe, insert

it in your chosen outlet port, then tighten
the hose clamp around it.
10. Loosen the hose clamp on the filteredwater outlet. Measure and cut anadditional length of pipe to connect yourfiltered water outlet to your rainwatertank. Insert it inside the filtered wateroutlet and tighten the hose clamp
around it.
11.

For best results, we recommend
plumbing the other end of this pipe
directly into your rainwater tank.

3.

Select appropriate brackets that will
support your Maelstrom and install theminside the riser at least 260mm (10.2”)
apart so there’s enough clearance foryour Maelstrom’s outlet.

4.

Mark where the outlet port will belocated on the tank riser and use a hole
saw to create the hole.

5.

Snap your Maelstrom out of themounting plate.

6.

Screw the mounting plate to thebrackets, ensuring it is centred.

7.

Remove the 100mm flexible couplingfrom the filtered water outlet (F), or you
may wish to cut away the filtered wateroutlet from your Maelstrom in the cutchannel provided to expand the outlet
size and allow more water to enter
your tank than the standard 100mmoutlet. This is recommended if your rain
harvesting system is designed to harvest
100% of your roof catchment area or if

you’re in an area that experiences highpeak flows during rain events.
8.

Snap your Maelstrom in place throughthe opening in the mounting plate.

9.

Loosen the hose clamp on your chosenwater inlet port. Measure and cut yourinlet pipe, insert it inside the tank riser
and connect it so it fits within yourchosen inlet port, then tighten the hose
clamp around it.

10. Loosen the hose clamp on your chosenwaste outlet port. Where practical, werecommend plumbing the overflow outlet
so that it directs excess water and debris
to stormwater. Alternatively, you cancap your waste outlet with a vented flapvalve.
11.

Whichever outlet option you choose,measure and cut your outlet pipe, insert
it in the tank riser and your chosen outlet
port, then tighten the hose clamp aroundit.

STORMWATER PIT MOUNT (600MM/24”)

MAINTENANCE

1.

If desired, your Maelstrom can beinstalled below ground level in an
appropriately sized stormwater pit.

For best performance, check and maintain your Maelstrom on a regular basis. The required
frequency of maintenance will depend on the environment in which your Maelstrom is installed.
High debris areas will require more regular maintenance than low debris areas.

2.

Determine the position of where yourfiltered water pipe will exit the pit andmark this position. The pipe can exit oneither of the four sides or through thebase.
If exiting through the side wall you may
wish to use a 90 degree bend to directly
connect your pipe to the Maelstroms
coupling.

To determine how frequently maintenance will be required in your location, we recommend
inspecting the Shark Cage filter after the first rainfall event and planning your maintenanceschedule based on this initial inspection.

3.

4.

5.
6.

7.

8.

Determine the position your inlet andwaste pipes will penetrate the sides ofthe pit wall and mark.
Mark the position of the support rodholes. Support rods should be approx.
108mm (4.25“) below the bottom of theinlet/waste pipes and approx. 300mm(11.8”) apart to allow adequate support ofthe mounting plate.
Drill out all penetration holes as required
and deburr.
Install and tighten threaded rod andappropriate nuts and washers toboth inside and outside of pit wallfor both supports. It is recommended
to use stainless steel or galvanisedcomponents.
Position the pit in place and install thefiltered water pipe allowing for therequired length to enter the coupling.
Seal around the pipe and pit wall using
appropriate sealant.
Lower the Maelstrom in place ensuring
the coupling is positioned over thefiltered water pipe and tighten the hose

To clean your Maelstrom, unlatch and remove the lid.
Grasp the handle on top of the filter and lift it upward to remove. Scoop out any large pieces
of debris by hand, then use a hose to wash out the Shark Cage filter. If required, you can use abrush to remove any debris. Lift the mosquito proof screen out and brush or hose off any debris
on either side of the screen.
clamps.
9.

Install the inlet and waste pipes throughthe pit wall and into the Maelstroms
coupling. Tighten the hose clamps andseal around the pipes and pit wall using
appropriate sealant.

10. It is recommended to install the pit with
an appropriate lid to prevent water
ingress.

Replace the mosquito proof screen, ensuring it sits securely in place. Reinstall the Shark Cagefilter to its position within the filter housing, then replace the lid and secure it with the latches.

OVERFLOW OPTIONS

INLET

INLET

WASTE

Straight waste outlet
allows the best self-cleaning
efficiency and great watercatchment.

WASTE

FILTERED
WATER

INLET

WASTE

Raised waste outlet with a flap valve
allows the best water catchment
and great self-cleaning efficiency
without the need to plumb a
dedicated waste pipe.

FILTERED
WATER

Raised waste outlet allows thebest water catchment andgreat self-cleaning efficiency.

FILTERED
WATER