The Sand Filter Pump Is An Efficient And Cost-Effective Solution For Maintaining Clean And Healthy Water In Above-Ground Pools. Unlike Traditional Filter Pumps, It Uses Silica Sand (Not Included), Which Only Needs To Be Replaced Every Three Years, Saving You Money And Hassle Compared To Frequently Replacing Filter Cartridges. The System Works By Filtering Water Through The Sand To Trap Dirt And Debris, Then Pumping Clean Water Back Into The Pool.