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. Designed 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, widely appreciated by customers, and durable. Strong and durable spool mesh 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 in water. 20-micron sediment filter coil cartridge for 9 3/4 and 10 inch filter housings or water purifiers. Ideal for pre-filtration applications, installed before water softeners or upstream of activated carbon filter cartridges for drinking water, or for treating rainwater used for irrigation, sanitary systems, or washing machines. For installation, compatible with standard single or double transparent filter housings with brass inserts, 1 or 3/4 inch, in 9 3/4 or 10 inch sizes. These coiled filter cartridges should be replaced at least once per year. Recommended for use in pre-filtration setups upstream of activated carbon or ultrafiltration cartridges. For optimal water purification, it is advisable to install a downstream cartridge with a finer filtration rating (e.g., 1 micron) to remove residual organic particles.