The Carvin 94089225 Laser Sand Filter Pump features a 7-way Dial Valve with sight-glass that provides automatic air relief, and it also works as a pressure gauge. The seven functions include: backwash, drain, filter, rinse, test, whirlpool and winterize. This finely manufactured pump comes with a non-corrosive resin clamp for easy installation and service, while its deep sand bed transports more debris to extend filter cycles. The Laser pump also is designed with a bottom drain for draining and winterizing. Hose and all hardware are included.
Specifications:

• Size: 22 1/2 in 
• Sand required: 264 lbs
• Operating Pressure PSI: 50

• Three Models available 19" (48,3 cm), 22,5" (57,2 cm) and 25" (63,5 cm) 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 m 3 /h/m 2 ) without sand migration or channeling.
• 7-way Dial Valve with "sight glass", automatic air relief, and pressure gauge. The 7 functions include : Filter, Backwash, Rinse, Whirlpool, Drain, Test & Winterize.
• Non-Corrosive Resin Clamp for simple installation and service of dial valve and filter components.
• Underdrain with "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. Features heavy-duty, freeze resistant hub and easy-service "Snap-Fit" laterals.
• Deep, high-capacity sand bed carries more debris and extends filter cycles.
• Blow-molded tank is corrosion-resistant, and UV-resistant.
• Bottom drain for winterizing and draining.