Product Description This is a 6 filters set for a standard Reverse Osmosis Water Filtration Unit or any type of Water Filtration Unit with 25cm housing.The specifications of the set are as follows: 6 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: 1 Micron.Dimensions: 25cm x 6.4cm 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 25cm filter housing.