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. FEATURES: Superior strength Service-Ease grid pack Continuous High Flow internal air relief* 100% factory tested Top-to-bottom backwash High Flow manual air relief valve Tension Control clamp Black valves and plumbing 1 1/2 in. bottom clean out port 7 1/2 in. centerline bulkhead fittings 24 SQFT FNS PLUS D.E. FILTER 180006 Regular price: $836.00 Sale price: $523.00 36 SQFT FNS PLUS D.E. FILTER 180007 Regular price: $720.00 Sale price: $599.00 48 SQFT FNS PLUS D.E. FILTER 180008 Regular price: $1,006.00 Sale price: $667.00 60 SQFT FNS PLUS D.E. FILTER 180009 Regular price: $1,092.00 Sale price: $752.00