This Pentek ECP1-20BB pleated cellulose polyester filter cartridge reduces sand, dirt, silt, rust, and scale particles in residential and commercial water. It has a nominal filtration rating of 1 micron at an efficiency of 85%. The filter is made of resin-impregnated cellulose and polyester media pleated around a polypropylene core for strength. It has an initial pressure drop of less than 1 pound per square inch (psi) at a flow rate of 20 gallons per minute (gpm), and operates over a temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C). This pleated cellulose polyester filter cartridge is for use in various applications, including drinking water purification, irrigation, and industrial processes, among others Reduces sand, dirt, silt, rust, and scale particles in residential and commercial water Nominal filtration rating of 1 micron Resin-impregnated cellulose and polyester media pleated around a polypropylene core for strength Initial pressure drop of less than 1 psi at a flow rate of 20 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C)