The lake water is clean generally and tests fine most of the time. There is a thread about this somewhere. The problem is there could be something that happens to go by your water line. That's why you need the UV. We have used lake water for 30 years and I would never want to have to use another source. It was by mistake that we started using it temporarily until we could get a well but once I used the lake water I didn't want to give it up then and I don't want to give it up now.
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