iSpring WGB32B 3-Stage Whole House Water Filtration System w/ 20-Inch Big Blue Sediment and Carbon Block Filters Equipped with gradient three stage filtration, iSpring WGB32B 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 20inches 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 and third 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, three big blue housings with caps, three filter cartridges, and a 4.5 inch housing wrench.