  Above Ground Pool Filters
High-rate sand filters use a special filter sand, normally .45 to .55 mm, because it has sharp edges that serve to separate particles, allowing filtration to take place. They operate on the basis of "depth" filtration; dirt is driven through the sand bed and trapped in the minute spaces between the particles of sand. Initially, a clean sand bed will remove larger particles. Then, as the bed starts to load up with dirt, it will remove finer particles.
If you prefer D.E. (diatomaceous earth), a D.E. filter will provide a deep, comprehensive clean, removing microscopic dust and pollen as small as one micron - 100 times smaller than a grain of salt. The D.E. powder need only be changed three or four times a season, each charge keeping your pool clean for four weeks.
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