Pack of standard pre-filtering and anti-sediment coiled cartridges, 20 microns, 9-3/4 inch, for standard 9-3/4 or 10 inch filter holder bowl. Suitable for installation on hot or cold water systems, these anti-impurity cartridges are ideal for filtering solid particles and fine organic matter. Features of the 9-3/4 inch 20 micron anti-sediment coiled pre-filtration cartridge pack: economical, durable, and highly rated by customers. Strong and durable spool mesh design ensures no fiber residue in water. High resistance to elevated temperatures. Made in Italy and ACS certified. High-quality wound polypropylene construction provides effective pre-filtration of organic impurities, rust, and dust. This 20 micron sediment filter coil cartridge fits 9-3/4 and 10 inch filter housings or water purifiers. Ideal for pre-filtration applications, to be installed before water softeners, upstream of activated carbon filters for drinking water, or for treating rainwater used in irrigation, sanitary systems, or washing machines. Compatible with standard single or double transparent filter housings with brass fittings, 1 or 3/4 inch, sized 9-3/4 or 10 inch. These coiled filter cartridges should be replaced at least once per year. Recommended for use as a pre-filter upstream of activated carbon or ultrafiltration cartridges. For optimal water purification, pair with a downstream cartridge of finer filtration (e.g., 1 micron) to remove residual organic particles.