Rainmax Filter

2 Stage Filtration

Rainwater from the rooftop is filtered in 2 stages, providing much cleaner water. 

First Flush System

Our unique First Flush System separates the initial turbid monsoon water providing cleaner water.

100 Micron Mesh

Our filtration element is a 100 micron stainless steel 304 mesh - the finest across all RWH filters.

Easy Install-

Designed for easy installation into existing infrastructures - houses, buildings, business complexes & industrial facilities.

High Efficiency

Filters and collects 95% of rooftop rainwater, losing only upto 5% along with leaves, dirt and other debris.

Self Cleaning

Equipped with the self cleaning capability to auto-flush debris out of the filter.

Reduces Costs

Saving on cost of water tankers, recoups investment quickly. No wear and tear;  only a 1 time purchase cost.

Clean Water Supply

Provides supplemental supply of clean water with low hardness, which can be used for domestic purposes.

Recharge Borewell

Excess water from your underground sump is connected to your borewell, recharging groundwater aquifers.


Priced competitively, the Rainmax filter is affordable in comparison to equivalent rooftop filters.

What is it?

Rainmax’s filter is the most effective, affordable and easy-to-use solution for Rooftop Rainwater Harvesting. It carries out a two stage filtration process through a fine stainless steel 100 micron mesh and its unique first flush system, effectively removing dust, leaves, contaminants and other debris. Watch the product video below for more information.

How it works

The video on the right will help you understand the mechanism our filter operates on. Rainwater from the rooftop passes through down-take pipes and enters the filter chamber. It filters through a fine 100-micron stainless steel (SS) 304 grade mesh. Around 5-10% of this water, along with leaves and debris, empties out through the waste water outlet. The remaining water enters into the first flush system, where initial turbid rainwater is trapped below the float ball and drained through the ball valve. Clean water then enters into the storage tank through the clean water outlet.

Rainmax Filters Use No Electricity

The Rainmax Filter uses no electricity or any other artifically applied source of energy. It simply used gravitational force to work effectively.

Play Video




Smart and basic. Serves roof areas of up to 1000 sq.ft.


Equipped with First Flush System. Serves roof areas of up to 1000 sq.ft.


Equipped with First Flush System. Serves roof areas of up to 2000 sq.ft.

Easy installation

Step 1: Affix the filter on to the wall, using the U-bolts and brackets provided.

Step 2: Connect the rooftop pipe to the filter chamber.

Step 3: Connect the clean water outlet to the storage tank, and the overflow pipe to the borewell.

Simple maintenance

Our filters are self cleaning. This easy annual maintenance process maximizes efficiency.

Step 1: Lift the cap off the top of the filter chamber.

Step 2: Loosen the bolts with the hex key provided.

Step 3: Clean the stainless steel filter mesh gently with a brush. Re-assemble.

Installation and maintenance video

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Headquartered in Hyderabad.

Available pan-India.