High quality double bottom ice filter box specially designed for central supply of houses and apartments. Contains 2 excellent quality filters. The first filter is 5mic polypropylene from Aqua Filter 10″ from polypropylene fibers from Aqua Filter (USA). Removes soil, rust, sediments, micro particles from 1 to 20 microns. Its lifespan varies from 3 to 12 months, depending on the quality of the water. It should be checked at regular intervals, which is why it is usually placed in a transparent filter case. The second filter is Aqua Filter FCPRA Polyphosphate Crystals. The polyphosphate crystal filter breaks down the salts in the water and makes it "softer" for use. The cartridge is changed approximately every 10 to 12 months, depending on the quality and quantity of water being treated. Polyphosphate crystals dissolve in water and effectively coat elements such as iron, calcium, magnesium, etc. making it impossible for these elements to settle out of the water and create the well-known problems associated with hard water, such as scale formation in pumps, washing machine resistors. Certified by: