Maelstrom Filter System (Rain Harvesting)
The Maelstrom (RHML01) by Blue Mountain Co, also known as Rain Harvesting, is an innovative pre-tank rainwater filter that combines super-fine filtration and super-high water catchment efficiency to give you cleaner rainwater and more of it.
Price $309.00 GST incl.
- Filters debris and removes suspended particles.
- Keeps out pests (including mosquitoes) and sunlight (to prevent algae growth).
- Easy installation – on tank-top, in-tank, wall-mounted or in a stormwater pit.
The Maelstrom (RHML01) by Blue Mountain Co, also known as Rain Harvesting, is an innovative pre-tank rainwater filter that combines super-fine filtration and super-high water catchment efficiency to give you cleaner rainwater and more of it.
Features and Benefits
- Cleaner water harvested – Maelstrom ultra-fine secondary filter removes particles down to 180 microns – 5 times finer than standard rain heads, tank screens and pre-tank filters. This gives you cleaner, better quality water and lowers the volume of sediment putting pressure on your tank pumps and post-tank filters
- Harvests high-flowing, fast water – Maelstrom eliminates the problem of water splashing off your tank inlet screen, especially at high flow rates. Its phenomenal water catchment efficiency of 36,000 litres per hour at 96% efficiency (which equates to 10 litres per second) gives you more water, faster, so you can take full advantage of every raindrop.
- Efficient rainwater harvesting – Efficiently filtering multiple lines at a single point is a simple way to keep tanks filled to the max.
How the Maelstrom Rainwater Filter Works
Maelstrom cleans rainwater through three-stages of filtration:
- The Primary Filter features a 2mm aperture to filter out leaves and large debris.
- The Secondary Filter features a 180 micron fine filter sleeve that stops the finer particles.
- The final 0.955mm Mosquito Proof Screen screen prevents mosquitoes from entering the tank.
Maelstrom Demonstration Video
Maelstrom Filter Installation Options
Maelstrom is easy to install and low maintenance.
It can be installed on new or old rainwater systems – either on top of the rainwater tank, in-tank, wall mounted or in an underground stormwater pit.
Maelstrom is versatile and suitable for all kinds of properties:
- residential
- commercial
- remote areas and farms
- schools/universities
- sustainable homes/green buildings
- transport hubs.
Maelstrom Filter Cleaning and Maintenance
Keeping your Maelstrom Filter free from silt, leaves and debris will help to ensure that your rain harvesting system can continue to perform at its absolute best. Watch this video to learn how to clean your Maelstrom Filter quickly and easily so that you can continue to enjoy superb filtration of your rainwater.
Maelstrom Filter Specifications
- Size: 506mm wide x 533mm depth x 392mm high (includes mounting plate and bottom outlet, refer to diagram below for details)
- 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
Maelstrom Installation & Specification Guide
Download the guide for full details including tools and materials for installation, installation options, overflow configuration options, detailed dimensions and specifications, and maintenance instructions.
Fast Delivery Australia-Wide!
Postage and handling $22 anywhere in Australia
- Orders are generally dispatched within 24-48 hours
- Delivery time varies based on your distance from Brisbane. Average transit times based on recent orders: Brisbane & Sydney - 1 day; Melbourne - 3 days; Adelaide - 4 days; Perth/Darwin, Rural and remote areas - 5-10 days
NOTE: You may provide "Authority to Leave" your order in a safe location if no one is home to receive it. The delivery service may not be able to deliver to some rural areas, so may leave your parcel at a local depot or LPO for collection. Unfortunately we cannot address deliveries to PO Boxes or Parcel Collect locations.
How often should I clean my Maelstrom’s filter screens?
Every environment is different, so the necessary frequency for cleaning your filter screens will vary. We recommend checking your Maelstrom filter regularly after installation to determine the rate at which debris accumulates. You can then use this information to make an informed decision about cleaning frequency. Depending upon your needs and situation, you may determine that cleaning is required monthly, quarterly, after each heavy downpour, or at a different frequency.
Do I need to modify the tank inlet when installing my Maelstrom?
No. Your Maelstrom is supplied with an adjustable flange that is designed to accommodate existing 300mm, 400mm and 500mm inlets. Simply remove the existing tank screen and trim the flange to suit the size of your inlet hole.
What head height is required when installing my Maelstrom on the inlet side of a wet or "charged" system?
Your Maelstrom filter should be installed no less than 500mm above the inlet of the tank.
When the Maelstrom overflow is connected to an outlet, for example, a stormwater discharge, the wet system head height can be reduced to accommodate low head systems. Collection efficiency is traded-off against low head height filtration.
What is the Maelstrom’s maximum flow rate?
On a wet rain harvesting system, your Maelstrom can handle water flowing at 10 litres (2.64 gallons) per second with a water catchment efficiency of 96%. It can handle water flowing at 5 litres (1.32 gallons) per second with a 99% water catchment efficiency for wet systems. Above 10 litres (2.64 gallons) per second, your Maelstrom will direct excess water to the outlet port (overflow).
Used in a wet rain harvesting system, your Maelstrom will yield 99% filtered water catchment at 5L/sec and 96% filtered water catchment at 10L/sec.
Are replacement filter bags available?
Yes. Replacement filter bags are available for your Maelstrom filter. The Maelstrom bag is designed to withstand general wear, be reusable and can be washed and reinstalled. Usually the filter bag only needs replacing due to something sharp getting caught through one of the holes in the basket, or being accidentally torn if removed. Should replacements be required, please let us know.
Can I connect multiple pipes or "lines" to my Maelstrom?
Multiple pipes can be consolidated before they reach your Maelstrom filter. However, it is important to assess the impact of consolidating these pipes to ensure that your total system flow is not restricted.
Can I install 90mm pipe to my Maelstrom?
Yes. You can use a tapered reducer or LIT (level invert taper) to connect 90mm pipe to your Maelstrom’s DN100mm inlet and outlet ports.
Can I install inlet pipes to both side ports so I have two inlets rather than one inlet and one outlet?
No. We do not recommend installing inlet pipes to both side ports. It is important that one side port is dedicated to overflow to allow your Maelstrom to perform its self-cleaning function and prevent clogging.
Can I install a first flush before my Maelstrom?
Yes. First flush diverters can be installed before or after your Maelstrom filter. If you choose to install a first flush diverter upstream of your Maelstrom, make sure you install a screened rain head before the first flush diverter so it cannot be clogged with leaves and larger debris.
Can the Maelstrom be installed in the charged area of a charged system? Ie. Can the Maelstrom be positioned below the inlet of the rainwater tank.
No. Your Maelstrom filter is not designed to carry a head of water, as the filter uses a self-cleaning gravity feed action to discard debris from the flow of water.
However, you can install your Maelstrom filter on top of your tank in place of your tank screen (or beside your tank) as the final filtering point for your wet system.
What do I do if there is a significant amount of water coming out of the debris overflow of the Maelstrom?
Check the following:
- Check the blue internal filter if there is a large amount of debris
- check the fine bag filter if there is a lot of fine debris
- Clean either of the above filters if required
If the rainfall event is extreme, it is possible for some unfiltered water to overflow from the debris overflow port. Refer to expected flow rates section.
How do I collect the maximum amount of water from my Maelstrom?
The best way to maximise the amount of captured water from the Maelstrom is to:
- Ensure the filters are maintained periodically
- An alternative setup for the debris overflow to maximise clean water catchment is to add a small upwards bend, which will help to slow the flow of water at the debris overflow – forcing the water through the Maelstrom’s filters. In this scenario, it is recommended to maintain your filters more regularly since the debris is forced to flow over the bend.
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