This Flowclear sand filter is a replacement part for a 1,000 gal. sand filter pump, and Bestway above ground pools that come with a 1,000 gal. sand filter pump such as Power Steel Swim Vista Series pools. This pump works its magic by circulating water out of the pool using silica sand or Bestway Polysphere Pool Filtration Balls. Sand and Polysphere filtration balls are sold separately.