There is no universal replacement interval for every refrigerator water filter. Many manufacturers use about six months as a reference, but water use, source-water quality, and the specific filter design can move that date earlier or later.
Start with the manufacturer’s interval
Check the exact filter model and the refrigerator manual. The panel indicator usually tracks time or estimated use; it does not directly test water quality, so interpret it with the model-specific instructions.
Heavy use can shorten the interval
A household that fills many bottles and uses ice every day sends more water through the filter media. If the manufacturer publishes a liter or gallon capacity, that limit may arrive before the calendar date.
Slow flow does not always mean a spent filter
Reduced flow can come from a loaded filter, incorrect installation, trapped air after replacement, low supply pressure, or a kinked line. Do not assume a new filter is needed before checking that the current one is seated correctly.
Do not rely on taste alone
A filter can be beyond its intended service life even when the water still tastes normal. Follow the manufacturer’s limit and use a compatible filter certified for the contaminant you actually want to reduce.