I think! I have tried everything (vinegar, lime, CLR, Zep acid toilet cleaner) to remove the hard water ring from my toilet and nothing has worked. I was afraid to use a pumice stone because I didn't want to scratch the toilet, but I got the idea to replace it anyway. My house is only 3 years old but our water softener wasn't working properly and these hardened rings were appearing. They were like concrete! So my pumice stone came and I went to her - first hesitantly, then with a vengeance. It didn't take much time or effort and the ring was gone. I wiped down the whole bowl as it wasn't smooth - the hard water left residue on it (except for what was below the waterline - it stayed smooth and shiny). Now everything is smooth and shiny. I tried to keep everything wet to avoid scratching it. I did our main bathroom first as a test (for scratches/damage) and plan to work on the rest of the toilets tomorrow. I used about 1/3 bar per toilet. I am more than happy. I just wonder how I lived 60 years without knowing anything about pumice! I've spent a lot of time, effort and money on things that didn't work.
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