Quote:
Originally Posted by eremite06
I've had the Nova system for years. Lately there's been a black residue leaching into the toilet bowl. Not sure why.
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This may not be the same issue you have, but I don't have a filtering system and get a dark mold build-up under the toilet rim. The cold water is warm in the summer while the hot tap is noticeably cooler when it first comes out of the tap. Anyway, the warmth seems to cause the mold. It's more specks of dirt than a color change when I wash it out, though.