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Sand filtration. This is probably the most popular of the three readily filtering methods available to the residential pool owner. The main reasons for this, they are simple, effective, usually cost less than the other options (cartridge or D.E.) and require very little maintenance. The filter canister is filled with sand. Water passes thru the filter canister and the debris in the water if trapped between the sand particles. When the sand becomes too dirty to effectively filter, the pressure in the canister rises because it is harder for the water to pass thru the canister. This signals to the pool owner that it is time to clean the sand. This is done by turning a valve on the canister and “backwashing” the sand to remove the debris. Sand filters typically filter out particles as small as 20 microns in size.