Hard tap water will destroy your PC with a lil time. Use distilled water to prevent the pitting from getting worse and to extend the life of any PC.
Good bit of advice. I bought a 25qt AA just recently and after only 3 uses there's already a lot of staining on the bottom and on the trivets. I'm going to be buying some PBW to clean it out before it gets worse, then will use distilled from there on out.
Anyone know if you can re-use your distilled water without any ill effect if just using it for sterilizing in the PC?