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Swimming Pool Glossary: Filter

Types of Swimming Pool Filters
A swimming pool filter traps and gets rid of large particles and gunk in you pool's water. This water is then pushed through a filter medium and recirculated into the pool. The most common types of pool filters are sand filters, cartridge filters, and diatomaceous earth (DE) filters.

Sand Filters
All sand filters employ two similar procedures: during filtration, water always moves from the top to the bottom; during filtering, a slotted underdrain holds back sand to allow clean water to move through.

In order to clean the sand in the filter, the water flow is reverse, or the filter is "backwashed".

Cartridge Filter
Cartridge filters have long been available but only recently have they really taken off.

As water passes through the cartridge, an element traps large particles from passing through. It also captures smaller particles inside small pores located inside the filter.

DE Filter
DE filtration is considered to be the best type of pool filtration system. DE filters are able to remove much tinier particles than either cartridge or sand filters.

DE filters use diatomaceous earth to filter the pool water. This earth is actually like a tiny sponge, with microscopic holes in it. Clean water can travel through these holes, but particles any bigger than 3 microns get trapped.

You can expect to spend anywhere from $100 to $1000 depending upon the type of filter you choose for your pool.

Hammer Share tips and advice on swimming pool filters with other DIYers in our Swimming Pools forum.