This Vevor sand filter provides an efficient and easy-to-use filtration system. With a max flow rate of 55 GPM, this filter can improve water cleanliness, water circulation, and ensure optimal filtration with its corrosion-resistant materials and reliable all-weather performance. This pool sand filter achieves optimal filtration performance perfectly with its 7 functions: filter, backwash, rinse, recirculate, waste, winter, and closed.