18" Pro-Series Sand Filter w/6-Position Top Mount 1-1/2" Valve. Providing you with quality you can trust, the Pro Series high-rate sand filters incorporate the latest pool filter technology to ensure your pool is operating at its very best. Molded of durable, corrosion-proof reinforced thermoplastic, they feature attractive, unitized tank construction for years of trouble-free operation with only minimal care. Pro Series sets a new standard for performance, value and dependability. Features: Flange clamp design allows 360 degree rotation of valve to simplify plumbing. Integral top diffuser ensures even distribution of water over the top of the sand media bed. Full-size internal piping provides smooth, free-flowing performance. Unitized, corrosion-proof filter tank molded of rugged, colorfast reinforced thermoplastic for dependable, all-weather performance. 7 position Hayward Vari-Flo control valve with easy-to-use lever-action handle lets you dial any of the valve/filter functions. Integral sight glass lets you see when backwash cycle is completed. Large pressure sand/water drain for rapid winterizing or servicing. Precision-engineered umbrella-fold self cleaning laterals for balanced flow and backwashing, plus easy serviceability. Will filter up to 16,800 gallons of water in 8 hours, requires 150# of sand.