Pentek S1-BB Water Filter Replacement Information: The Pentek S1-BB water filter is easy to install in big blue whole house systems or commercial water filtration systems. The Pentek S1-BB filter cartridge should be replaced approximately every 4 months or 16,000 gallons of water. The filter change interval also depends on your water supply and water usage. Pentek S1-BB Water Filter Equivalent Brands: The following Culligan water filter model holds the Pentek S1-BB sediment water filter cartridge: HD-950. The following Ametek, USFilter, and Plymouth Products model holds this sediment water filter cartridge: #10 Big Blue. The Pentek S1BB Sediment Water Filter Cartridge also fits Cuno, AquaPure, Omni, Sears, Fulflo, Teledyne Water Pik, Ace, Master Plumber, Flotec, Honeywell, General Electric, American Plumber, and most other water filter housings for 10" x 4.5" filters. . .Pentek S1-BB Pleated Water Filter Cartridge Specs: Dimensions:9.75" x 4.5" (248 mm x 114 mm) Micron Rating (Nominal):20 Micron Temperature Rating: 40?F to 145?F (4.4?C to 62.8?C) Initial ∆P (psi) @ Flow Rate (gpm): 1.2 psi @ 10 gpm (0.08 bar @ 38 L/min) Surface Area: 2070 sq. in. (1.34 sq. m.) Recommended Flow Rate: 20 gpm (76 Lpm) Pentek S1-BB Sediment Filter Materials of Construction: Filter Media:Resin-Impregnated Cellulose End Caps:Vinyl Plastisol Core:Polypropylene (Package Of 2).