We use it as an initial filter for the water that comes into our house from the well. The water then goes through our water softener and our drinking water goes through a reverse osmosis system. We bought our house in October and didn't bother to change the filter until early November. Apparently the previous owners haven't changed the filter for a long time. As soon as we changed the filter, we immediately noticed an improvement in the taste and smell of our water. Very happy with this filter. We will change it every two months or so as recommended.
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