This Pentek CBC-BB carbon filter cartridge reduces fine sediment, chlorine taste and odor, and protozoan cysts in residential and commercial drinking water. It has a nominal (85%) filtration rating of 0.5 micron, and 99.95% efficiency for the reduction of protozoan cysts. It will reduce free available chlorine (FAC) at 2 parts per million (ppm) by at least 90% in up to 50,000 gallons at a flow rate of 2 gallons per minute (gpm). This cartridge is made of bonded powdered activated carbon (PAC) filter media wrapped in polyolefin with polyethylene outer netting.The cartridge has an initial pressure drop of 4.6 pounds per square inch (psi) at a flow rate of 2 gallons per minute (gpm), and operates over a temperature range of 40 to 180 degrees F (4.4 to 82.2 degrees C). This carbon block filter cartridge meets National Sanitation Foundation/American National Standards Institute (NSF/ANSI) standard 42 for quality assurance, and is for purification of residential and commercial drinking water.Features:Reduces fine sediment, chlorine taste and odor, and protozoan cysts in residential and commercial drinking waterNominal filtration rating of 0.5 micronBonded PAC media with polyolefin wraps and polyethylene nettingInitial pressure drop of 4.6 psi at a flow rate of 2 gpmTemperature range of 40 to 180 degrees F (4.4 to 82.2 degrees C)