Hello; Have you checked the pH of the tap water (source water) Here is a suggestion. Check the pH of the source water immediately and then let the source water sit in a container for a day or so and check again.Hello; A vague notion has occurred to me but I cannot think it out just now. A nagging thought having something to do with litmus paper or titration. may be nothing but I posted so I can find this thread if my thinking clears up.
Also check the tank water pH before a WC and after a WC.
Not sure what I am getting at with this just yet.
