Six months is common, not universal
Many major refrigerator-filter families specify replacement at approximately six months. Some also provide a gallon capacity such as 170, 200 or 300 gallons. The exact manual and performance sheet control.
Replace sooner when the rated capacity is reached
A high-use household can reach the gallon rating before six months. Reduced flow can also indicate loading, but it can have other causes such as supply pressure, a partially closed valve or an installation problem.
Do not extend life because the water still tastes fine
Taste and odor are not reliable indicators of all contaminants. A filter’s rated service life is based on test conditions and its exact claim set, not on whether the water remains pleasant.
Use a calendar reminder
Each filter page on WaterFilterSpecs can generate a private calendar file in your browser. No account or email address is required.
Sources
- 01About choosing home water filters
CDC · U.S. public-health guidance
- 02LG refrigerator water-filter installation
LG Electronics · Official manufacturer support article