The Watts SF20-978 string wound filters are compatible replacement filters that fit the following water filter housings:
The Watts 10" String Wound Filter - 20 Micron is a 20 micron water filter cartridge made of FDA grade polypropylene fibers that will reduce sediment, sand, dirt, rust, and other impurities in your water. This Watts water filter offers excellent chemical compatibility and high dirt holding capacity, all at an economical price. This string wound filter is made of FDA grade polypropylene and is suitable for potable water as well as industrial use. The Watts SF20-978 polypropylene string wound filter is also commonly known as a PP filter cartridge.
The Watts SF20-978 specifications:
Filter life depends on water quality and usage. This Watts water filter should be changed when a decrease in pressure is noticed.