Working great so far. 3 months. So glad I don't have to look at water stains. Yay!!
Krazy Klean, after a few emails, honored their 10 warranty by shipping me out new ones. Very happy with how well these work. My original ones were effective for about 3 years. For the money, not having to scrub toilet rings and stains for several years is worth it.
I thought the toilets in my house were clean before, but kept getting rings in the bowls. Since I’ve used the pumice stone, however, the toilets have stayed clean.