A. Pack of standard pre-filtering and anti-sediment coiled cartridges 20 microns in 93/4 for standard 93/4 or 10 filter holder bowl. B. To be installed on a hot or cold water network, these anti-impurity cartridges will be ideal for filtering solid matter or fine organic particles. C. The advantages of the 93/4 anti-sediment 20 micron coiled pre-filtration cartridge set: Economic pack, appreciated by customers and durable. Strong and durable spool mesh - no fiber residue in the water. High resistance to high temperatures. Made in Italy and ACS certified. Wound polypropylene cartridges, they provide effective pre-filtration of organic impurities, rust or dust in the water. D. Sediment filter coil cartridge 20 microns for 9 3/4 and 10 inch filter holder or water purifier. These cartridges are ideal for pre-filtration, placed before your water softener, or upstream of a filtration cartridge at the activated carbon for drinking water or even to treat rainwater intended for watering, sanitary facilities or even your washing machine. E. For the installation of this cartridge you can equip yourself with a simple filter holder or a double transparent filter holder with brass insert 1 or 3/4 compatible in standard size 93/4 or 10 available on our shop. F. ADDITIONAL INFORMATION: These coiled filter cartridges must be replaced at least once a year. We recommend that you use these cartridges for filtration or prefiltration of water upstream of an activated carbon filter cartridge or ultra filtration cartridge (membrane). It is also advisable to place a cartridge with a lower filtration threshold downstream of it (1 micron for example) to correctly finish the purification of your water and eliminate all residual traces of organic matter in the water. Available in express delivery 24 to 48h.