This Hydronix SDC-25-4001 polypropylene sediment filter has a particle retention size of 1 micron and is used in a water filtration system. This coreless filter has an outside diameter (OD) of 2.5" and overall length of 40". It is made of polypropylene which can be sterilized, has dimensional stability, and is resistance to most chemicals. It is certified by the American National Standards Institute and National Sanitation Foundation (ANSI/NSF) Standard 42 for quality assurance, and is FDA approved, for the material requirements only. This sediment filter is suitable for use in applications such as ice machines, film processing, beverage, coffee, analytical, wineries, and many 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, 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, 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.Hydronix Water Technology is a supplier of water filtration, purification and separation products. The company, founded in 2010, is headquartered in Chino Hills, CA.