Jandy’s SFTM sand filter has a unique internal design that produces superior flow and efficient operation. Features include: corrosion and UV resistant thermoplastic tank construction, 7-position dial valve, combination sand and water drain, automatic internal air relief and quick-connect unions. Features:• Deep high-capacity sand bed carries more debris and extends filter cycles. • Blow-molded tank is corrosion and UV-resistant. • Bottom drain for winterizing and draining. • Available in 22.5" (572 mm) and 25" (635 mm) models. • Upper Distribution System integrated into the dial valve and engineered to direct water evenly across the entire surface of the sand. Up to 25 gpm/sq.ft (61 m³/h per m²) without sand migration or channeling.• Non-Corrosive Resin Clamp allows 360° rotation of the dial valve for simple installation alignment and service of dial valve and filter components. • Heavy-duty, freeze-resistant under-drain with “snap-fit” side-slotted laterals draws water evenly across the full diameter of the sand bed for higher flows, better filtration, longer cycles and more efficient backwashing. • 7-Way Dial Valve with “sight glass”, automatic air relief, and pressure gauge. The 7 functions are: