Economical light weight filters for Big Blue/Boy 10" housings. Certified by NSF 42 and FDA CFR title 21.Pureteck sediment filter cartridge's coreless design is an economical solution to pre-filtration for many applications. They are used widely as pre-filtration for RO systems and post-filtration for GAC filters. 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 scale Suitable for Municipal and well waterSpecifications: Micron Rating: 1 Nominal Dimensions: 10" x 4.5" Weight: 6 oz Filter Media: Polypropylene Filter Life: Recommended every 6 months