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How Rotorflush Self-Cleaning Filterpumps™ Work

C J Hiscock


How Rotorflush Self-Cleaning Filterpumps™ Work to keep Filter Mesh Clear in Dirty Water

Our submersible pumps all incorporate Rotorflush’s unique and patented self-cleaning filter mechanism – it's how Rotorflush self-cleaning filter pumps work. The same self-cleaning mechanism keeps the filter mesh clear on all our products. Our submersible filter pumps with their built-in self-cleaning intakes produce a continuous backwash to the filter mesh whenever they run.  This way pumping water and screening water are combined in one powerful, low maintenance, easy to install submersible filter pump.

Here’s how Rotorflush self-cleaning filterpumps™ work to keep filter mesh clear in dirty water:

A Built-In in Backwash

The self-cleaning Rotorflush filter built onto our submersible pumps is cleaned completely every ½  – 1¼ seconds (depending on the size of the filter pump). This constant backwash keeps any solids away from the filter screen, preventing them entering the pump and beyond.

The automatic backwash keeps the filter screen clean and free from debris without interrupting the filter output. Pump output is not affected. The very efficient self-cleaning action allows fine filter meshes to be fitted without fear of blockage. Pumps, filters and any upstream nozzles and valves are protected from blockage and damage.

Traditional pumps are fitted with a coarse intake screen which will only keep out the large particles. If there are any solids in the water these screens often block, starving the pump of water and needing frequent cleaning. Not so with the Rotorflush self-cleaning system for filters and filter pumps.

The self-cleaning part of the filter consists of a rotating housing that has two angled jets. The blue arrows show the main flow of water. This water is drawn through the filter screen and into the pump impellers.

The red arrows show filtered water inside the filter being sucked into the filter impeller and ejected out through the rotating jets. These angled jets direct water back through the filter removing any detritus that is beginning to block the screen and also making them rotate at approx 30 – 60 rpm.

The blue flow, generated by the pump, is high volume but relatively low speed.  The red backwash flow is a much smaller volume but washes the mesh at a much higher velocity.   The jets inside the filter gently remove debris, suspended solids and aquatic life away from the filter mesh without impeding the flow of water through the filter.

Diagram of a filterpump

That’s how Rotorflush self-Cleaning filterpumps™ work!


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