Did the calculations, which are easy since we're only using this for coffee in a one-cup coffee maker. If we both drank 3 cups of 12oz coffee a day, the filter would last about 20 days. We managed to get 30 days out of which we had to wait 15-30 minutes for the last 10 days to filter out 6 cups of water. A NOTICE. We use water from the fridge that is already filtered. I throw away the Gravity Clear20 when I use my last filter in about 3-4 weeks!
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