How does a Sand Filter Work?

When water is pumped through the sand filter tank which is filled with sand, the debris and other small object will be caught by the sand. Usually the contaminants that is 20 microns or larger can be filtered out by a sand filter.

When there’s more and more debris caught in the sand, the pressure in the sand filter tank will be larger and the filtration efficiency will reduce accordingly. Then you will have to backwash the sand filter to make it clean as before and it will continue to work properly, keeping your pool in a good condition.