Quote:
Originally Posted by retiredguy123
The ring at the water level is an accumulation of calcium deposits that is formed when the water in the bowl evaporates. The mold grows on the calcium ring. Use a pumice stone to remove the calcium from the toilet bowl and you will stop the mold from growing.
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This is the correct answer! I’ve done this on one toilet of ours that doesn’t get used a lot and gets a black ring. The pumice stone takes care of that ring and it stops it from coming back for quite a while.