What is filtration?
There are several types of filters available for swimming pool water. Sand and gravel, diatomaceous earth, anthracite, and cartridge types are the filter mediums most commonly employed. Regardless of the medium used, the basic principles are the same. This consists of passing water through tiny passageways. Particles larger than these passages are trapped and thereby separated from the main body of the water. This process continues until all of these passageways are blocked. The filter must then be cleaned and the cycle repeated.
