Maelstrom Rainwater Filter
Exclusively brought by Vardhman Envirotech in Indian market, the Maelstrom™ Rainwater Filter sets the new standard for rainwater filtration and can deliver clear, colorless, odorless and plentiful rainwater into rainwater collection tanks. The Maelstrom Rainwater Filter is easy to install on new or existing Rainwater Harvesting Systems and is compatible with all standard pre-filtration equipment.
Also features an ultra fine 180 micron filter that removes particles five times smaller than normal screens. It also delivers rapid flow rates, all while retaining a 96% water catchment efficiency!
Maelstrom can be mounted many different ways, to best suit any application! When it comes to drip irrigation systems, a Maelstrom Rainwater Filter will drastically reduce the chance of clogging the drip emitters, as the rainwater flowing into the rainwater storage tank will be very clean.
Advantages of Maelstrom Rainwater Filter
Features of Maelstrom Rainwater Filter
Successful installations
Maelstrom Rainwater Filter FAQ's
The screw recommendation for a Maelstrom is 8G x 1" screw. As long as the screw penetrates into the tank top properly it is ok. If it's a concrete tank, be sure the right anchor/plug is used for installing into concrete (and the user might decide to use a 1.5" fasteners instead)
If safe to do so, 150mm can be fitted using a 150-100 reducer. Maelstrom is typically rated to handle 10L/s flow rate so it is just something to consider with 150mm pipe if they expect higher flow rates. We are working on a 150mm Maelstrom, not ready yet (in prototype stages) but definitely coming.
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.
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.
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.
The volume of water which the Maelstrom can filter can sometimes vary depending on the system setup.
In a charged (or wet) rainwater system, the Maelstrom can handle water flowing at 10 litres (2.64 gallons) per second with a water catchment efficiency of up to 96%. At 5 litres (1.32 gallons) per second, the Maelstrom can filter up to 99% of water flowing through it.
The level of debris flowing through the system, and the frequency of maintenance can affect this. In most systems, expect between 60-95% catchment efficiency. If the filter is kept generally clean, it will be towards the upper end of the scale.
In a dry rainwater system (one where the water does not go down and then up again back to the tank), you can generally expect about 20% less catchment efficiency than a wet system. This is due to the water moving at a faster velocity, for the same given flow rate. At flow rates under 5L/second, the Maelstrom performs generally equal, whether it's a wet or dry system.
As a guide:
60mm/hr falling on a 350sqm roof… If it were all going to a single pipe, the flow rate would be 5.83 L/second
2.5 inches/hr falling on a 2,000sqft roof… If it were all going to a single pipe, the flow rate would be 0.87 Gal/second
These rainfall intensities represent a heavy rainfall. In Brisbane, it only rains above these intensities about 3% of the time - almost all rainfall events are under this intensity.
Yes. Replacement filter bags are available for your Maelstrom filter. The Maelstrom bag is designed to be reusable and can be washed and reinstalled. In the unlikely event that your bag is damaged or lost, replacements are available from Blue Mountain Co.
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.
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.
Yes it's ok to install pipes into both sockets of the Maelstrom. The Maelstrom can handle a high flow of water (at least 10L/sec) and the filter will still perform well. Note that the unit will not be able to self clean at all, so ensure to check the filter occasionally and empty it if required. By checking the filter after the first major rain event, you will be able to predict how often you may need to clean the filter.
You will also need to have an air break somewhere upstream to ensure water can't flood back to the gutters. i.e. A rain head or even a Y junction on the downpipes which allows water to flow past on the way to the tank but cascade out of should the pipe become full of water (pictured below).
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.
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.
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.
