Check back with me in a few years but, so far, a great product
It’s so far so good. I haven’t seen any hard water stains but we don’t really have that problem. What I have noticed is that I’m seeing very little of the black mold under the rim. That’s a huge plus! I would recommend this product for everyone. You won’t be disappointed. It does what it claims.
You will never have that mineral build up, rust or rings. It does the job. You will never have to use a scrub brush on it again for that. But you will have to clean your toilet from other stains like urine will discolor it. Other than that it does what it says it will do.