How Does a Pool Filter Work?


What are Pool Filters?

  • Pool filters are useful tools in keeping your swimming pool clean and clear from debris. Water containing small particulate matter passes through the filter and comes out the other end cleaner. This cleaner water is not only more pleasant to swim in, but also healthier and more aesthetically pleasing.

How do Pool Filters Work?

  • Pool filters are situated between inflow and outflow hoses going into and out of the pool, respectively. The outflow hose comes out of the pool toward the filter and sucks water out of the pool. This hose is usually placed halfway down the side of the pool, so it an suck water in that is near the middle or bottom of the pool (if it were placed near the top, the water would not circulate properly). When the water flows through the filter, which is usually constructed of some sort of fabric and looks like an air filter of a car, particulate matter is captured. Then this cleaner water flows through the inflow hose back into the pool. This hose pumps water into the pool closer to the surface of the pool than the outflow hose. The two hoses coming into and out of the pool at different heights creates a current, of sorts, that helps circulate the water in the pool, so more of the water gets filtered through.

Pool Filter Care

  • Pool filters must periodically be cleaned. Debris, including insects, leaves and grass clippings will clog up the filter and reduce its efficiency. Most pool filters can be cleaned only a certain number of times, then must be replaced.

The Difference Between a Pool Filter and a Skimmer

  • Skimmers can also be used in addition to a pool filter. Skimmers can remove larger pieces of debris, leaving the smaller debris to be removed by the filter. These sit on the top of the water and pull the water from the surface rather than underneath the water. Using a skimmer can lengthen the life of your filter somewhat, but the filter still needs to be cleaned regularly to maintain proper function.

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  • Photo Credit Stephanie Berghaeuser
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