The first stage filter : PPF meltblown filter , commonly known as PP cotton Size: 10 inch Function: rust can effectively filter the water , sediment , colloids, suspended solids and other coarse solids . The second stage filter : granular activated carbon filter , commonly known as CTO Size: 10 inch Function: granular activated carbon adsorption high , effective adsorption of chlorine , odor , color and other substances. 3-6 Month Filter Life: By replacing your water filter every 3-6 months, depending on your water quality, you keep your water tasting great. High Quality Filtration: This filter reduces dirt, sediment, sand, silt, rust and corrosion, and other particles Use tap water pressure to provide power and no need electricity. Wall-mounted, pedestal-mounted, easy to install, suitable for household main intake pipes or water dispensers requiring pre-filter protection, boilers, water heaters, RO machines, etc. Made with food-grade PET materials, high strength, toughness, corrosion resistance, protect from secondary pollution. The sealing ring can effectively prevent leakage, seepage, explosion protection, freezing and dropping. Screw seal, bottle mouth thickening treatment, explosion-proof, thick spiral seal, safe leak-proof, transparent can be observed whether the filter needs to be replaced. Specification: Material: Plastic Size: A 1/4 inch - 23x13x31cm/9.05x5.12x12.2inch, Inner diameter of thread: 1.14cm B 1/2 inch - 23x13x31cm/9.05x5.12x12.2inch, Inner diameter of thread: 1.86cm Package Includes: 1 Piece 2 Stage Water Filter 1 Piece PP Cotton Filter 1 Piece CTO Filter 1 Piece Plastic Wrench 2 Pieces Pipe joint