The Hydronix SWC-25-2005 polypropylene String wound filters have a particle retention Size of 5 microns and are used in a residential and commercial water filtration system applications. The Filter has an outside diameter (OD) of 2.5" and overall length of 10". made of 100 per cent Pure polypropylene cord, the cartridge has structural stability, and is resistant to most chemicals. The SWC series Filter is suitable for use in filtration systems such as residential water filtration, Whole House, Well Water filtration, ice machines, film processing, beverage, coffee, analytical, Wineries, and many others. Your water will be free from all kinds of bacteria, germs and other contaminants that can cause ill health to you and your family.