WATTS FLOW-PRO SERIES 2.5" DIAMETER X 5" FILTER - 1 MicronThe WATTS FLOW-PRO 2.5" diameter Melt Blown 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. WATTS SERIES filters are also used in applications such as Ice Machines, Film Processing, Beverage, Coffee, Analytical, Wineries, and many others. WATTS FLOW-PRO FPMB1-5 Information & Application: WATTS FLOW-PRO FPMB1-5 fits in most water filter housings that use 20" x 4.5" filters. The WATTS FLOW-PRO FPMB1-5 is a 1 Micron Polypropylene Sediment filter used to remove dirt, rust, sand, sediment and silt from your water. The WATTS FLOW-PRO FPMB1-5 is economically priced and comparable to the. Commonly Called "Spun Polypropylene" or "Melt Blown," these Filter Cartridges are Rapidly Becoming the Industry Standard for Filtration. The WATTS FLOW-PRO FPMB1-5 will fit Pentek, Ametek, US Filter, Flowmatic, Watts, TGI, American Plumber, GE, Culligan and other brands of filter housings that require a standard size 4.5" x 20" Cartridge. This filter should be changed every 6 to 12 months depending on water quality and usage. Manufactured from 100% pure polypropylene fibers Graded-Density for higher dirt holding capacity Tested and certified by NSF International under ANSI/NSF Standard 42 for material only WATTS FLOW-PRO FPMB1-5