Hayward commercial HCF series sand filter features tool-free, twist-lock, threaded-free dome-tip lid with O-ring seal. This system improves water distribution over the filter bed resulting in longer filter cycle time, improved filtration and a more efficient backwash cycle. Made of fiberglass material. A rapid open/close lid mechanism with positive O-ring seal simplifies operation and ensures long-term durability and reliability. The 1.5-inch commercial grade one-piece injection molded, 360 degree slotted laterals arranged in a grid array provide superior filtration performance. It has large 9-inch top opening for easy media loading and filter inspection, 2-inch full bottom drain with a 3/8-inch integral water drain with media screen. The factory-built manifolds available for configuring banks up to 6 filters. The infusion molded, multi-layer, gel-coated thermoset fiberglass structure is complemented with oversized, grid-array laterals. NSF listed. Effective filtration area 4.75-square feet, residential design flow rate 95 GPM, filtration rate 5-20 GPM per feet and backwash flow rate 33-95 GPM. 50 PSI maximum working pressure, 37-inch, 30-inch vertical and side clearance. Comes with 2-inch bulkhead connections. Available in 30-inch size. Measures 38-inch length by 38-2/7-inch width by 54-2/7-inch height.