Details: This FNS Plus filters are fiberglass reinforced polypropylene of advanced chemical resistant materials for superior strength and reliability. The top manifold design features the service-ease grid pack for convenient one at a time grid servicing. Unique internal design ensures optimal filtration and backwashing efficiency for longer runs between cleanings. 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. 36-square feet effective filtration area, 72-GPM flow rate. Turnover Capacity: 8 hour-34560 gallons, 10 hour-43200 gallons, 12 hour-51840 gallons. Measures 22-inch length by 33-1/2-inch height by 22-inch width.