| * High-rate sand filters use a special filter sand, normally .45 to .55 mm (also known as pool grade #20 silica sand), because it has sharp edges that separate particles, allowing filtration to take place.* They operate on the basis of "depth" filtration where dirt is driven through the sand bed and trapped in the spaces between the sand particles.* Initially, a clean sand bed removes larger particles, and then, as the bed starts to load up with dirt, the filter removes finer particles.* The sand can be cleaned by backwashing which involves reversing water flow through the filter to the "waste" line.* All Hayward sand filters with Top Mount valves features 7 position options that make pool maintenance and filter cleaning easy and convenient. |
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Product ID : S166T
Price: $196.51
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Product ID : S144T
Price: $160.05
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