This Hydronix SPC-25-1050 pleated polyester filter has a particle retention size of 50 micron, and is used in a water filtration system. It has an outside diameter (OD) of 2.5" and overall length of 9-7/8". It has a non-woven polyester body for resistance to chemicals and bacteria, a polypropylene core, and vinyl plastisol end caps. This filter is washable and reusable and can withstand temperatures ranging from 40 to 125 degrees F. This pleated polyester filter is suitable for a variety of residential and commercial water filtration applications.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.