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 anti-sediment 20 micron coiled pre-filtration cartridge set: economical pack, durable performance, strong and robust spool mesh with no fiber residue in water, high resistance to elevated temperatures. Made in Italy and ACS certified. High-quality wound polypropylene cartridges provide 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, upstream of activated carbon filter cartridges for drinking water, or for rainwater treatment used in irrigation, sanitary systems, or laundry. Compatible with standard single or double transparent filter housings with brass fittings, 1 inch 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 as pre-filtration upstream of activated carbon or ultrafiltration cartridges. For complete purification, it is advisable to install a downstream cartridge with a finer filtration rating, such as 1 micron, to remove residual organic matter.