The Watts FPMB20-978 is a 5-micron pleated sediment filter cartridge. Its 5-micron rating effectively captures sand, silt, rust, scale particles, and other fine sediment from your water supply, protecting downstream equipment and improving water clarity. The pleated design increases surface area, allowing for higher dirt-holding capacity and longer service life compared to standard spun or melt-blown sediment filters of the same size.

The Watts FPMB20-978 measures 9-7/8" in length with a 2-7/8" outer diameter, making it a standard size that fits most 10-inch Big Blue-style whole house filter housings. It's specifically designed for Watts filter housings but is also compatible with other standard 9-7/8" x 2-7/8" housings. Always verify your housing's internal dimensions before installation to ensure a proper seal.

The Watts FPMB20-978 typically lasts 3 to 6 months or up to 15,000 gallons, depending on your incoming water quality and daily usage. Homes with heavy sediment, well water, or high water consumption may need more frequent replacement. A noticeable drop in water pressure or visible discoloration of the pleats is a clear sign it's time to replace the cartridge to maintain optimal flow and filtration performance.

Yes, one of the key advantages of the Watts FPMB20-978 pleated polyester cartridge is that it can be rinsed and reused multiple times before final replacement. Simply remove the cartridge, rinse it with clean water to flush away accumulated sediment, and reinstall. This reusable design makes the FPMB20-978 a cost-effective choice for homes with heavy sediment loads, though eventual replacement is still necessary once cleaning no longer restores adequate flow.

No, the Watts FPMB20-978 is a mechanical sediment filter only and is not designed to remove chlorine, chemicals, VOCs, taste, or odor. It targets particulate matter such as dirt, rust, sand, and silt at 5 microns. For chlorine or chemical reduction, pair the FPMB20-978 with a carbon block filter in a dual-stage filtration system for comprehensive whole-house water treatment.