RF1100LW Self-cleaning Strainers and Eel Screens

RF1100LW filters are general purpose suction intake basket strainers with a built-in self-cleaning mechanism that back-washes their mesh as your pump draws water. These are all stainless steel, high volume screens developed specifically to meet the challenges of EPA and Environment Agency regulations for raw water abstraction.  Ideal for Eel screening and Fish protection.

The designation ‘RF1100’ indicates that the filter mesh is 1100 mm in diameter (overall diameter is 1250 mm). Dirty water is screened at source, helping to prevent the intake, pump and any connected equipment from blocking. 

Rotorflush self-cleaning intakes attach to the suction of surface mounted pumps. Here are some typical uses of these filters:

• Cooling water screening for EPA Rule 316 (b) and Eel Regulations compliance
• Screening industrial process water
• Screening water when draining / flooding wetlands
• Protecting district wide heat pump installations
• Screening for desalination plant intakes

Self-cleaning water intake screens - ‘AR’ type screens or ‘LW’ type screens?

The difference between a self-cleaning intake screen or filter designated AR, and a self-cleaning intake screen or filter designated LW is in their construction.

‘AR' type strainers and filters are made with a cage frame around which filter mesh is wrapped. This is held in place by a clamp. The filters are easily identifiable as ’AR' type, as the filter mesh area comprises a series of mesh windows.

‘LW’ type strainers and filters do not have a cage body; the mesh is the filter body.  The filter mesh is tensioned between the filter top and bottom plates, and is tight - like a drum skin.  This gives the mesh structural integrity and strength.  ‘LW’ filters are easily identifiable as the body is all mesh.

What's the diff?

The ‘AR’ type self-cleaning filters and strainers are very strong - the body being made up of a cage and a clamp - two layers of steel - and are suitable where conditions are challenging such as turbulent river or seawater locations. Smaller AR filters up to 600 mm diameter can be fitted with mesh down to 315 microns. 

The downside of their tough design is that they handle less water for the size of screen, because the open area of the mesh is reduced by the cage and clamp.

LW filters can only be fitted with mesh of 1 mm or greater aperture. This is because the mesh needs to be robust enough to tension. The ‘LW’ type self-cleaning filters and strainers are also strong - but are more suited to applications and settings where low intake velocities are required - for example for fish or eel screening at cooling water and raw water intakes.

The on the plus side they handle more water than the ‘AR’ type filters for the same size of screen, because the open area of the mesh is maximised; the mesh is area is not reduced by a supporting cage or clamp.

Rotorflush RF1100LW self-cleaning suction intakes can be fitted with:

RF1100LW self-cleaning basket strainers are ideal for screening and pumping raw water, cooling water, and seawater, particularly where there is a need to protect aquatic life. Their high volume, low-velocity intake easily complies with EPA and Environment Agency rules.

The strainers have a dry weight range from approx. 200kg - 320 kg depending on model and outlet flange size, lifting gear is required to move them. RF1100LWs can be suspended in lakes, lagoons or rivers, or floated from buoys, or raised and lowered on a guide-rail system.  They can often be bolted directly on to the intake of vertical and immersible pumps.

For best performance, make sure that there is good clearance around the strainer mesh so that back-washed debris can disperse, and that the RF1100LW is above any silt or sludge that may accumulate.

We also manufacture stands and guide rails specifically designed for our products to help you site and maintain them.

Usually very little. Although they are self-cleaning, all of our products will require a manual clean every once in a while.

Stainless mesh can be cleaned with a pressure washer. How often depends on your mesh size and what you are filtering.

As a minimum, we recommend the following:

• Coarse mesh that is 1 mm or bigger should be inspected and cleaned every 6 - 12 months

Full maintenance guidelines can be found in the instruction manual available from the download link above.

All our products are guaranteed for at least a year.  Full details in our Terms and Conditions.