BESTWAY | Flowclear Sand Filters White | BES115TOY01095The Flowclear 1500 gal. (5678 L) Sand Filter from Bestway is a highly efficient way to keep clean water flowing through your above ground pool. It is a more cost effective solution as the pump uses silica sand instead of a traditional filter cartridge. While those cartridges need to be replaced every 2 weeks, silica sand lasts up to 3 years. The sand will trap dirt and debris, but a pre filter strainer basket catches larger things so that the pump