FNS® Plus Fiberglass D.E. Filters are fiberglass reinforced polypropylene of advanced chemical resistant materials for superior strength and reliability. The top manifold design features the ServiceEase grid pack for convenient one-at-a-time grid servicing. NOTE: Filter Backwash Valve is not included and must be purchased seperately. Square Foot: 60 Grid Type: Full Color: Almond Type: In-Ground