Hard water and filter life for EPTWFU01
Know that refrigerator carbon filters are not water softeners. The published Frigidaire record identifies this cartridge as PureSource Ultra II Water Filter.
Start with fit verification
Match the complete refrigerator model and the code printed on the existing cartridge. Genuine Frigidaire PureSource Ultra II filter. Confirm fit using the complete appliance model number. Do not infer compatibility from color, overall shape or brand alone.
Service baseline
The available record uses 6 months. Water quality, usage and long periods of inactivity may justify earlier service.
Safe action
Review the refrigerator Use & Care Guide and flush after installation as directed. If the cartridge does not seat normally, water does not return after flushing, or the housing leaks, stop and use the refrigerator’s model-specific manual.
Evidence
Open the linked source before purchase. FilterRef separates published compatibility from general troubleshooting guidance and does not treat an aftermarket cross-reference as automatically equivalent.