Hard water wears out fridge filters early. Soft water buys you months.
Enter your zip code and we'll estimate how often to replace your refrigerator's water filter, from regional water-hardness data for your area.
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Replace your filter every months
- Next replacement
- Water hardness
- Classified as
Estimate based on regional water-hardness data — not a reading from your utility.
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How the estimate works
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Step 1
Zip code to county. Your zip code maps to a U.S. county — that's the finest grain public water data reaches.
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Step 2
County to hardness. We look up the typical water hardness for that area, in grains per gallon, from regional water-hardness data.
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Step 3
Hardness to schedule. Harder water clogs a 200–300 gallon filter sooner. We adjust the standard 6-month interval up or down — and for your household size, if you tell us.