Hayward ProSeries W3S166T1580 16" Sand Filter System with 1HP pump. Pro-Series™ filters are performance matched with our above-ground pump series to ensure a system that maximizes its filtration ability. They utilize a precision engineered umbrella-fold self-cleaning lateral system to provide efficient flow and evenly distributed water for long lasting performance. Pro Series sand systems are designed and equipped to offer the ideal combination of energy efficiency and outstanding water clarity. A broad selection of filter sizes, pumps, and accessories allows you to choose and merchandise the system(s) that best suit your above-ground pool program.