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Marge, I put a 3m, single water filter under the kitchen sink. This filters only the cold water at this tap as I didn't want to filter all the water for the monty. This is were we get water to drink from as well cook. The unit cost around $80.00 and the replacement filter is around $ 37.00 filter.
I think next year I wiil buy one of the filter units from Wal Mart $36.00 and put it on the exterior to filter the water comming in and the replacement cartiages are only around $7.00.
I will still maintarin the one under the sink as it works great and the Mariette says so.
Joe
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