Dual Whole House Water Filtration System with 3/4" Inlet / Outlet Brass Ports (125-10D-S-C).-excellent to remove chlorine, sediment, odors and many other chemicals and contaminants. This unit will effectively eliminates many impurities from tap water to offer sparkling clean and great tasting water throughout your whole house.Melt-blown Polypropylene Sediment filters"“ Sediment filter is often the first filter installed in the Reverse Osmosis circuit. Sediment filters are made of fine melted polypropylene, which is then blown and spun in a cylinder-like form. The main function of a sediment filter is to remove large and fine particles from a drinking water, such as sand, dirt, silt, and rust particles. Removal of such particles allows for a better performance of all the following filters, such as Carbon Block or GAC filters.Lifetime: Replace two or three times a year, depending on the water quality.Block Activated Carbon filters"“ Block Carbon Filters are similar in their performance to that of GAC filters, being made of fine coconut shell carbon they also do remove odors and tastes of many organic compounds, chlorine especially. Though, because this filters are made of a packed carbon (forming a cylinder block), they offer a much finer filtration of suspended particles and dirt.Lifetime: Replace two or three times a year, depending on the water quality.3/4" Inlet / Outlet Brass Ports5 Micron Sediment 10"�x 2.5"� REMOVES LARGE AND FINE PARTICLES FROM A DRINKING WATER, SUCH AS SAND, DIRT, SILT, AND RUST PARTICLES.5 Micron Block Carbon 9.875"�x 2.5"� REMOVES ODORS AND TASTES OF MANY ORGANIC COMPOUNDS, CHLORINE ESPECIALLY.Housing WrenchBracket, Screws