Apex 3-Stage Whole House 20-Inch Big Blue Water Filtration System w/ Sediment and Carbon Block , Iron & Hydrogen Sulfide Reducing Filter &ndash; KDF 85 MR-3030 hydrogen sulfide reduction filter contains a combination of KDF85 media and organic coconut shell activated carbon. The KDF-85 effectively reduces dissolved iron and hydrogen sulfide odor over a wider pH range than possible with standard oxidation filters such as manganese greensand, thereby protecting your plumbing system including toilets, bath tubs and showers, and appliances such as clothes washers and dishwashers, from unsightly staining and odor. KDF 85 Process Media removes 99% of water-soluble lead, mercury, nickel, chromium, and other dissolved metals, Also forms are effective in controlling the buildup of bacteria, algae, fungi and scale, making them ideal for use in GAC beds. COMPLETELY ASSEMBLED, Ready to Install & Wall mount option as well. The first stage high capacity polypropylene sediment filter  Extracts suspended materials such as sediment, rust, insects, and other particles down to 5 microns. This cartridge also extends life of other, more expensive cartridges and prevents damage NSF Certified, acid washed, high performance Organic coconut shell activated carbon Block Filter absorb heavy chlorine byproducts such as chloramines, THM, and TCE. The double carbon briquettes filter out organic matter from water without release of carbon fines. Also, this carbon block removes volatile organic compounds (VOCs), insecticides, pesticides and industrial solvents. 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