Watts SF1-20 String Wound Sediment Cartridge
Standard 20-inch polypropylene string wound filter for sediment removal in whole house and under-counter applications. 1 micron rating, 2.5-inch diameter.
Wound Construction for Depth Filtration
String Wound Design
Polypropylene string wound in graduated density layers traps sediment progressively from surface to core, extending filter life and maximizing dirt-holding capacity.
1 Micron Filtration
Removes fine sediment, silt, rust, and particulate matter down to 1 micron, protecting downstream equipment and improving water clarity without media migration.
Chemical Resistance
Polypropylene construction resists a wide range of chemicals and contains no leachables, meeting FDA requirements for food and beverage contact in potable water systems.
140°F Rated
Handles temperatures up to 140°F (60°C) with operating pressure rated to 40 psi, suitable for most residential whole house and point-of-use installations.
Standard 20-Inch Housing Fit
The Watts SF1-20 fits any standard 20-inch filter housing with 2.5-inch diameter capacity. Common in Watts Premier whole house systems, under-counter housings, and universal 20" housings from most manufacturers. Verify your housing accepts 20" x 2.5" cartridges before ordering.
Replacement Schedule
Standard Replacement
Replace every 3 to 6 months depending on sediment load and water usage. High sediment conditions may require more frequent changes.
Flow Drop Indicator
Replace sooner if you notice reduced water pressure or flow rate, indicating the filter has reached capacity and is restricting flow.
Poly Bag Packaged
Sealed for cleanliness until installation
Potable Water Safe
FDA-compliant food grade materials
Versatile Application
Works in whole house or under-counter systems
No Media Migration
String stays intact throughout filter life
