Pentair 180008 FNS Plus Fiberglass Reinforced Polypropylene Material, Vertical Grid, D.E. Pool Filter, 48 Square Feet, 96 GPM Chemical-resistant fiberglass-reinforced polypropylene tank for exceptional strength and long life Easily removable filter grid pack is secured by a single nut to simplify maintenance Unique internal design ensures optimal filtration and backwashing efficiency for longer runs between cleanings Operating limitsmaximum continual operating pressure of 50 psi. Pool/spa (bather) applications, maximum operating water temperature (internal filter) 104 F (40 C). Curved vertical grids provide maximum filter surface area for better cleaning This Filter has a conveniently located 1-1/2-inch drain for easy and efficient cleanout; measures 22-inch length by 45-inch height by 22-1/2-inch width