The supplied Swimming Pool Sand Filter uses sand to filter the impurities out of the water. Sand is put in the filter vessel and the water is forced under pressure through the bed of sand. Sand filters are a popular option for keeping swimming pools clean. These filters use natural sand as a filtering agent, trapping debris as it passes through so that only clean water is pumped into the pool. The water molecules pass through the gaps between the sand grains but solids in the water are held back in the gaps between the grains. The offered Swimming Pool Sand Filter is very effective and made for use in the various commercial and household swimming pools.