The Watts SF-10-425 string wound sediment filter delivers reliable full-flow filtration in a 10" x 4.5" form factor built for both whole house and point-of-use applications. Constructed from 100% polypropylene string, this cartridge offers excellent chemical resistance and meets FDA standards for potable water contact without leachable contaminants.
SPECIFICATIONS
Watts SF-10-425 Technical Details
| Model Number | Watts SF-10-425 |
| Dimensions | 10" x 4.5" (9.75" length x 4.5" OD) |
| Filter Media | 100% Polypropylene String Wound |
| Micron Ratings Available | 1, 5, 20, 50 micron options |
| Temperature Rating | Up to 140°F (60°C) |
| Pressure Rating | 40 PSI maximum |
| Certifications | FDA compliant for food and beverage contact |
| Applications | Whole house, under counter, RO pre-filtration |
INSTALLATION & USE
Replacement Process
- Turn off water supply and relieve system pressure by opening a downstream faucet
- Unscrew filter housing, remove old cartridge, and clean housing sump with mild soap and water
- Remove Watts SF-10-425 from poly bag, inspect o-ring on housing cap for damage, and insert new cartridge
- Hand-tighten housing, turn water supply back on slowly, and check for leaks
- Flush filter for 3-5 minutes before use to remove any loose fibers or air
COMPATIBILITY
System Compatibility
The Watts SF-10-425 fits standard 10-inch filter housings with 4.5-inch diameter capacity from Watts, Pentek, Culligan, and other major brands. This string wound cartridge works as a sediment pre-filter for reverse osmosis systems, whole house applications, or under-counter drinking water setups. Available in multiple micron ratings to match your specific filtration needs, from fine 1-micron sediment removal to coarser 50-micron protection for well water or heavy particulate loads.
🔧 Pro Tip: String wound filters work best in gradient filtration setups. If you're dealing with heavy sediment, install a coarser 50-micron cartridge first, then follow with a 20 or 1-micron stage to extend filter life and reduce replacement frequency.
