Maelstrom Water Tank Filter

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Sale price$358.00 Regular price$399.00


Maelstrom Water Tank Filter

Our revolutionary Maelstrom filters set a new standard in pre-tank rainwater filtering. Filtering multiple pipes at a single point, the Maelstrom’s unique U-shaped filter keeps leaves and debris down to 180 microns out of your rainwater tank. They also significantly increase your water catchment efficiency, even at high flow rates (96% at 10 litres per second in wet systems). 

Shark Cage Only & Replacement Bag available here: 

How it works

Our original Maelstrom filter uses a dual filtration set comprising of a primary plastic cage and a secondary fine mesh bag:

* Rainwater enters the Maelstrom through either of the horizontal-facing couplings.
* The rainwater then enters the Primary Filter (J). The unique curved filter slows the velocity of the water by changing the direction of its flow.
* Surrounding the Primary Filter is a Secondary Filter (C), comprising of a nylon mesh bag which filters fine particulates larger than 180 micron. This filter assembly is easily removable and will require periodic maintenance.
* The filtered rainwater then continues to move through the Maelstrom to the Filtered Water Outlet (F) and into the rainwater tank or pipe (if attached). 

Shark Cage Option

Boost your Maelstrom's performance with the Shark Cage Filter Upgrade. The stainless steel Shark Cage filter provides the same level of fine filtration, but with the benefit of greater water catchment efficiency, and far easier cleaning, than our original Maelstrom. The single-skin stainless steel mesh is slippery and makes it difficult for leaves and debris to get caught. The single skin is also a breeze to backwash - no bags to remove - just hose it down and replace it in the housing. More amazing quality water in your tank with less fuss. You can also simply swap your original filter for the Shark Cage upgrade.


* Primary Filter: 2mm (0.08") Aperture, Polypropylene
* Secondary Filter: 0.18mm (180µm) Aperture, Nylon
* Mosquito Proof Screen: 0.955mm (0.04") Aperture, SS316
* Inlet & Outlet Pipe Size DN100 (110mm OD) / 4” OD
* Coupling Flexible: EPDM
* Body & Base Plate: ABS, Polypropylene
* Base Plate:  Fits 500mm tank opening, cut to fit 400mm or 300mm tank opening

* Not Included- 6 x zinc plated screws

Performance Data 
Water Catchment Efficiency @ 5L (1.32gal) / second* 99%
Water Catchment Efficiency @ 10L (2.64gal) / second* 96%

Features and Benefits: 

* A single point, tank-top filter with a ground breaking U-shaped 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 debris build-up through Self-flushing.
* Blocks out light that supports algae growth.
* Is a versatile product, able to be installed in a variety of pre-tank locations.
* Reduces frequency and cost of tank cleaning by lowering common sediment build up through cleaner tank water.
* Mounting plate fits 300mm, 400mm and 500mm tank openings, or can be used for mounting in-tank, on wall or in a pit.

Installation Guide  


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