I had followed a thread last week that sounds much like my situaiton. The toilet flushes, and everything goes down the first time. Second and subsequent flushes back-up in the bowl. The flushing is not really particulary energetic -- and the toilet has been installed for over 20 years and we have relatively hard water. I tend to think that the suggested Muriatic Acid fix is needed, but first a question!
I am on a septic system. Is the Muriatic Acid fix something I should avoid? If so, what's next? A new toilet?
Thanks, Mark