I bought the Krazy Klean Pro about a month ago. i placed it in my toilet tank as soon as I received it and my toilet bowl is staying clean much longer and no more rings! A great purchase. Only time will tell if it actually lasts for 10 years.
I have had them for over two weeks now and I haven’t had to brush my toilet bowl as they stayed clean.
These Krazy Klean Pros are great. They keep the toilet bowl super clean with NO TOXIC chemicals. Been using them a month and I think they are the BEST!!! .