Water filtration is the passing of water through a medium which will retain the solids suspended in that water. For swimming pools the filtration system includes the filter, pumps, flow fittings and water circulation pipework valves and fittings all of which make up the filtration system.

Sand Filters

Generally the filter vessel contains a bed of graded sand which may or may not be supported on a bed of aggregate. The pressure created by the water flow compressing the sand bed to the base of the vessel creates microscopic gaps between the grains enabling the suspended matter to be trapped by the sand. A system of collectors at the bottom of the filter allows through passage of water but not sand.

Cleansing of the sand is achieved by reversing the flow through the vessel; the gap between the sand bed and influent spreader allowing for the sand to be lifted and expanded thus washing off the dirt.
This is what is known as a Backwash.

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Cartridge Filters

Cartridge filters uses a system where the filter internal is re-usable. Once saturation point has been reached the cartridge is removed and cleaned or replaced if necessary.

Cartridge filter are ideal for use in confined spaces, or where it is difficult or even impossible to install and use sand filters due to the disposal of backwash water.

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