Have used these for 5 years and change them every two months. With prolonged use, it starts to smell like well water again. The filters are very good for foul smelling water up to two months when no other filter could last longer than 3 weeks to a month. Tried all filters and this internal filter is the only one that can last more than a month before failing. the scents of the water return. When I'm not drinking the water I filter it and pass it through UV light to ensure bacteria/pollutants from the well water don't get onto dishes or skin.
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