This Pentek CW MF string wound polypropylene filter cartridge reduces sand silt scale and rust particles for municipal drinking water and industrial fluid applications It has a nominal filtration rating of 30 microns at an efficiency of 85. The filter is made of polypropylene fiber cord that is wound on a rigid polypropylene core for greater surface area for strength and high dirt loading capacity It has an initial pressure drop of less than 1 pound per square inch psi at a maximum flow rate of 10 gallons per minute gpm and operates over a temperature range of 40 to 165 degrees F 4 4 to 73 9 degrees C. This string wound filter cartridge is for use in various applications including drinking water purification irrigation and industrial processes among others. Water filters remove undesirable particles chemicals and microorganisms from water by means of a semipermeable barrier adsorption or biological processes. They are made of densely packed synthetic or natural fibers that trap suspended particles and materials that block microbes or adsorb unwanted chemicals or substances that cause a chemical change such as acid neutralization. For most residential commercial and industrial applications water filters are manufactured in the form of replaceable cartridges that fit inside permanent housings. Filtration systems typically consist of a series of two or more types of filters each designed to remove different contaminants. The performance of filters is measured by the minimum particle size that is blocked the percentage of particles or microorganisms that are removed the downstream concentration of unwanted chemicals and the maximum flow rate and the amount of water that can be filtered before the filter must be replaced. Water filters are used in a wide range of applications including drinking water purification swimming pools industrial processes and irrigation among others. Pentair manufactures industrial commercial and residential water filtration components and systems. The company founded in 1966 and headquartered in Minneapolis MN meets International Organization for Standardization ISO standards 9001 and 14001 for quality assurance.