Product details:

The oldest and most popular method of filtration is sand. Sand filters share two things in common 1 When in the filtration mode water always flows from top to bottom 2 They all have some sort of lateral or under drain with slots to hold back sand while allowing clean filtered water to pass through. High-rate sand filters use a special filter sand normally.45 to.55mm also known as pool-grade 20 silica sand 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 particle of sand. Initially a clean sand bed will remove larger particles and then as the bed starts to load up it will remove finer particles. Cleaning of the media or sand bed is accomplished through reversing the flow through the filter to the waste line. This is known as backwashing.Features. Item weight - 2.90 lbs.