Hard water and filter life for LT800P
Know that refrigerator carbon filters are not water softeners. The published LG record identifies this cartridge as LT800P Refrigerator Water Filter.
Start with fit verification
Match the complete refrigerator model and the code printed on the existing cartridge. Genuine LG replacement filter. Confirm fit with the refrigerator model number before purchase. Do not infer compatibility from color, overall shape or brand alone.
Service baseline
The available record uses 6 months or 200 gallons, subject to the manufacturer’s whichever-comes-first instructions. Water quality, usage and long periods of inactivity may justify earlier service.
Safe action
Follow the model manual and flush the filter after installation. 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.