p5-40 spun polypropylene filter cartridge reduces sand, silt, scale and rust particles in residential, commercial, and municipal drinking water. it has a 5 micron nominal rating and is 2.5x40". the filter is made of spun polypropylene fibers for resistance to chemicals and bacteria. it has an initial pressure drop of 0.3 psi at a flow rate of 20 gallons per minute (gpm). the temp range is 40- 145 degrees.