The Pentek ECP1-20BB Sediment Water Filter media is pleated around a rugged polypropylene core for additional strength, with end caps and gasket fused together for a unified and reliable whole. This filter is a great deal, with more surface area than most competitive cartridges (36 square feet of media, compared to 27 square feet in other brands). It's easy to install, with a long-lasting filter life. Recommended for chlorinated water supplies only. 1 Micron Pleated Cellulose--ultrafine filtration in a clean, reusable cartridge Strong and reliable, with a special formulation of resin-impregnated cellulose and polyester fibers Provides higher wet strength than regular cellulose cartridges Features high flow rates and dirt-holding capacity, while maintaining extremely low pressure drop Genuine OEM Product Used In Brands: Ametek, Culligan, Pentek, US Filter MSDS Document: N/A Advertised Size (in): 20 x 4-1/2 Media: Cellulose Polyester Primary Filter Media: Pleated Polyester Materials of Construction: Core: Polypropylene, End Caps: Vinyl Plastisol Filter Life (months): 6 months Micron Rating (Nominal): 1 Operating Temperature (A°F): 40 - 125 Operating Temperature (A°C): 4.4 - 51.7 Flow Rate (gpm): 20 Flow Rate (lpm): 75.708 Additional Information: End Cap Color: Tan Specification: Used In Brands: Ametek, Culligan, Pentek, US Filter MSDS Document: N/A Advertised Size (in): 20 x 4-1/2 Media: Cellulose Polyester Primary Filter Media: Pleated Polyester Materials of Construction: Core: Polypropylene, End Caps: Vinyl Plastisol Filter Life (months): 6 months Micron Rating (Nominal): 1 Operating Temperature (A°F): 40 - 125 Operating Temperature (A°C): 4.4 - 51.7 Flow Rate (gpm): 20 Flow Rate (lpm): 75.708 Additional Information: End Cap Color: Tan California proposition 65 warning Used In Brands: Ametek, Culligan, Pentek, US Filter MSDS Document: N/A Advertised Size (in): 20 x 4-1/2 Media: Cellulose Polyester Primary Filter Media: Pleated Polyester