Product Description This is a 2 filters set for a standard Reverse Osmosis Water Filtration Unit or any type of Water Filtration Unit with 10" housing. The specifications of the set are as follows: 2 of 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. Micron rating: 5 Micron. Dimensions: 9.75" x 2.5" Lifetime: Replace two or three times a year, depending on the water quality.. All Filters are individually wrapped and sealed. All filters meet NSF Standards and Regulations. Filters will fit any Residential Reverse Osmosis Unit that features standard 10" filter housing.