So I waited 3 months before writing this review to see how well they worked. I can honestly say I am pleasantly surprised at the results. I normally have horrible hard water stains that appear after a week or 2 of scrubbing them off. After 3 months of dropping these in my tanks, they have not re-appeared! My toilets look amazing. I was hesitant to spend $99 for all three of my toilets but this product is well worth the money. I would highly recommend them if you suffer from hard water stains!

I was skeptical, but this works, 2 weeks in and no ring. We have very hard water where I live and this is a blessing in fact I’m ordering my 3rd one.

Seems to be working just fine!!

Have hard water. Moved into an older home. Opened toliet tank and it was disgustingly awful. Through in the Kraft lean pro and it has changed it completely. My toliet also is cleaning. Glad I gave this a try.

Hi I am surprised it works I was shocked, I had to tell my husband I had to put the one in our second bathroom toilet,
Thank you for the suggestion about the product. I told my sister I haven’t heard from her yet.
Thank you, Henry B