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 anti-sediment 20 micron coiled pre-filtration cartridge set: economical pack, durable design, and high customer satisfaction. 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. This 20-micron sediment filter coil cartridge fits 9-3/4 and 10 inch filter housings or water purification systems. Ideal for pre-filtration before water softeners, activated carbon filters, or ultrafiltration membranes. Also suitable for rainwater treatment used in irrigation, sanitary systems, or washing machines. Compatible with standard single or double transparent filter housings with brass inserts, 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 complete purification, pair with a downstream cartridge of finer filtration (e.g., 1 micron) to remove residual organic particles.