In our toilets the rings disappeared in about a week.
So far, our toilets are sparkling clean! Haven’t had to clean them since we put the Krazy klean in the tanks three weeks ago.
We are empty-nesters in anyone with 4 bathrooms, 2 of which are rarely used, creating rings in the bowl.
Krazy Klean has totally eliminated the rings in all four toilets. I’ve been telling everyone about this product that actually WORKS as it claims!!
I never really expected it to work, but it actually does!
I put the unit in my basement bathroom, A bathroom that is not used on a daily basis. There was a film coating the bottom of the toilet from the water just sitting idle...no longer a film. So I would say it is working great.