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These Mineral Stones replacement (13846) is for compatible use with the Gravity Water Filter Purifier system (1384). When it's time to change the components, a red light indicator will appear in your filter system. We recommend changing the filter and replacing the mineral stones approximately once a year, or around every 3 filter changes, depending on your water usage. Note: It is our suggestion to not leave filtered water that would soak the mineral stones, as this will diminish its longevity. For better water taste result, transfer filtered water to a serving pitcher or glass container.