My brother in law is not on this site, but sent me these pictures, and asked what these dark spots could be. I waiting on his numbers, but thought I would help him out and get ahead start with some pictures..
Probably Calcium scale. Could be metal stains if he got suckered into buying a "mineral pack" of some sort. Also possible if he's overloaded it with any of the Chlorox Blue pool chemicals. The blue is copper sulfate.
Probably Calcium scale. Could be metal stains if he got suckered into buying a "mineral pack" of some sort. Also possible if he's overloaded it with any of the Chlorox Blue pool chemicals. The blue is copper sulfate.
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