Three different types of systems are available and each uses a different
means to achieve the same goal of cleaning your pool water. The first type is a
sand filter that sifts impurities through a bed of silica sand. The sand lasts
between three and five years before it degrades and can no longer catch
particles. This is the system that is most offered in pool packages.
The next type is a diatomaceous earth filter which uses a fine white
powder made from crushed seashells to trap pollutants. Each week some
additional replacement powder is required and at least once a year all of the diatomaceous
earth powder must be changed.
The final type is a cartridge filter that uses a densely packed
cartridge made of 100 percent polyester material. It can last indefinitely
given the right circumstances of regular cleaning and pool chemistry balance.
In all cases, the pool water enters into the skimmer which is about four
inches below the surface of the pool. It travels through a connecting hose and
is sucked into the pump where it is pushed out at a high rate of speed and
forced into the filter canister under pressure. The system purifies the water
through one of the previously mentioned filter media and then sends it back
into the pool.
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