This Vevor sand filter system is designed to keep pool water clean and clear with steady filtration for fine debris and suspended particles. It delivers up to 40 GPM of flow and includes a 7-way multi-port valve for flexible operation modes such as filter, backwash, rinse, recirculate, waste, winter, and closed. The corrosion-resistant PE tank is built for long-lasting outdoor use in above-ground and in-ground pool setups. With 1-1/2" inlet and outlet fittings, it is made for straightforward installation and routine pool maintenance.