The USWF 20x4.5 Melt Blown Sediment Filter has a 5-micron nominal rating, meaning it captures particles as small as 5 microns in size. This filter is specifically engineered to reduce sand, silt, rust, dirt, scale, and other suspended sediment particles from your water supply. Its 100% pure polypropylene melt blown construction features a graded density design — with a coarser outer layer and a finer inner layer — providing superior dirt-holding capacity and longer filter life compared to standard spun or string-wound sediment filters.

This USWF sediment filter measures 20 inches in length by 4.5 inches in outer diameter (often called a "Big Blue" size). It is designed as a direct-fit replacement for standard 20" x 4.5" whole house filter housings, including Pentek, Pentair, American Plumber, and other common Big Blue-style housings. Always verify your existing housing accepts a 20x4.5 cartridge before ordering to ensure a proper seal and optimal performance.

The USWF 20x4.5 melt blown sediment filter typically lasts 3 to 6 months under normal residential use, depending on incoming water quality and household consumption. Homes on well water or with high sediment levels may need to replace the cartridge more frequently, while homes on municipal water with low turbidity may see longer service life. We recommend inspecting the cartridge periodically and replacing it when you notice reduced water pressure or visible discoloration.

The USWF 5 Micron 20x4.5 Melt Blown Sediment Filter is manufactured from 100% FDA-grade pure polypropylene fibers that meet NSF/ANSI Standard 42 material requirements for taste and odor. It contains no binders, adhesives, or surfactants, making it safe for use in potable water applications. While the filter is built to NSF/ANSI 42 material standards, it is designed purely for mechanical sediment reduction and should be paired with a carbon block or other specialty filter for chemical or contaminant removal.

The USWF 20x4.5 melt blown sediment filter is ideal for use as a pre-filter in whole house filtration systems, installed at the point-of-entry where water first enters your home. Placing it upstream of carbon filters, water softeners, UV systems, or reverse osmosis units helps protect downstream equipment from sediment fouling and extends the life of more expensive filtration stages. It can also be used in light commercial and agricultural applications requiring high-flow sediment reduction.