Pool filters are a vital part of a pool's equipment. There are currently three different types of swimming pool filters available: diatomaceous earth filters, cartridge filters, and sand filters. Diatomaceous filters utilize a powder called diatomaceous earth or DE. The DE coats the internal grids of the filter, and water is pumped into the filter through the grids. This leaves virtually pure, completely filtered water to return to the pool. Cartridge filters utilize a pleated cartridge to filter the water. Cartridge filters generally should be reserved for smaller bodies of water such as a spa. Sand filters utilize a mixture of sand and pea gravel. The water is pumped into the top of the filter, passes through the sand bed, and then exits the filter. Regardless of the type of pool filter you have, Clarity Pools is the most qualified company to service and repair or upgrade your current filter.