Hayward Pro Series 20” Side Mount Sand Filter - S310S (also known as W3S310S). Pro Series high-rate sand filters are the very latest in pool filter technology. Molded of durable, corrosion-proof polymeric material, Pro Series filters feature an advanced, self-cleaning lateral underdrain system for smooth, efficient flow and totally balanced backwashing. For crystal clear water with only minimal care, pool professionals choose Pro Series.
- Top diffuser ensures even distribution of water over the top of the sand media bed. All internal piping is 2" to give smooth, free-flowing performance
- Automatic air relief purges any trapped air during operation of the filter system
- Unitized, corrosion-proof, filter tank molded of rugged, colorfast polymeric material dependable, all weather performance
- 7-position Hayward Vari-Flo™ control valve with easy-to-use lever-action handle lets you dial any of the 7 valve/filter functions. Integral sight glass lets you see when backwash cycle is completed
- Precision engineered umbrella-fold self cleaning laterals for balanced flow and backwashing, plus easy serviceability
- Large pressure sand/water drain for rapid winterizing or servicing
- Durable, flanged inspection cover provides convenient access to top of filter
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