Hayward W3S310S - ProSeries Side-Mount Sand FilterThe Hayward ProSeries Side Mount Sand Filter is a durable and corrosion proof filter housing that is reliable in all types of weather. This high performance filter uses an umbrella fold self cleaning lateral system that will provide clean water at an even flow back to the pool through a 6 position VariFlo Valve or a 2 position Slide Valve. Adding this filter to a pool will ensure crystal clear and sparkling water for bathers to enjoy. Model Valve Flow