iSpring WGB22B 2-Stage Whole House Water Filtration System w/ 20-Inch Big Blue Sediment and Carbon Block Filter Equipped with gradient two stage filtration, iSpring WGB22B whole house water system removes sediment, chlorine, rust, pesticides, herbicides, industrial solvents, VOCs, and various other contaminants. With 1 inch NPT inlet/ outlet, it has minimum impact on water flow (up to 15 GPM) and requires minimum maintenance. Installed at the main water supply to treat all the water you use in your entire home. Enjoy better water from every tap and every appliance in the whole house. Big Blue 20 inches x 4.5inches filter cartridges allow for minimal pressure reduction and extended filter life. Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS), thus it keeps the healthy minerals in the water. The first stage high capacity polypropylene sediment filter achieves filtration down to 5 microns. The second stage CTO Carbon Block filter uses high quality coconut shell carbon for maximum filtration efficiency and filter life. Both are tested by independent third-party to meet NSF/ANSI Standards. Both filters have a capacity of 100,000 gallon of water to supply one full year of clean water for a family of four. Package includes - black metal bracket, two big blue housings with caps, two filter cartridges, and a 4.5 inch housing wrench. The model # of the original filter cartridge pack in the system is F2WGB22B, which includes these genuine iSpring Big Blue Filter cartridges: FP25B and FC25B.