Since I had to remove 42% of the water to get my CH level corrected I figured it would be a good time to remove the water line stain. I started out w/ a 4:1 mixture of muriatic acid and water in a sprayer. It would not remove it. 2:1 NOTHING. 100% NOTHING. I have tried using a brush and a scotchbrite pad. Still won't budge. I was thinking of trying CLR. Do you think it will contaminate the water? Any other ideas? I may have to go rent a jackhammer to get this stuff off.
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