. . . . "They are also used in applications such as Ice Machines, Film Processing, Beverage, Coffee, Analytical, Wineries, and many others.Polypropylene Sediment, 4 layer structure nominal micron rating.Reduces fine sediment, sand, silt, rust and scaleSuitable for Municipal and well waterSpecifications: Micron Rating: 1 Nominal Dimensions: 20 x 2.5 Weight: 6 oz Filter Media: Polypropylene Filter Life: Re" .