Ispring Wcb22B 2Stage Whole House Water Filtration System W/ 20Inch Big Blue Sediment And Carbon Block Filter Filters the incoming water supply for your entire home Removes up to 95% of sediment, chlorine, rust, pesticides, herbicides, industrial solvents, VOCs, and various other contaminants Big Blue 20" x 4.5" filter cartridges allow for minimal pressure reduction and extended filter life High capacity polypropylene sediment filter achieves filtration down to 5 micron, tested by independent third-party to meet NSF/ANSI Standard CTO Carbon Block filter uses high quality coconut shell carbon for maximum filtration efficiency and filter life, tested by independent third-party to meet NSF/ANSI Standard