Review on Enhanced Fluidmaster 8100 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System with Blue Cartridge by Mike Quade

Since Fluidmaster makes such great fill valves I decided to take a chance as I HATE this ring in the water line that is forming in my toilet. Well I bought two of these blue ones so I can see when it's time to change the cartridge. I cleaned both toilets thoroughly and then did a simple install. Within a week, the ring began to appear and continued to grow. I now clean my toilets weekly as soon as the rings appear - something this product supposedly eliminates the need for. He just doesn't do what he's supposed to do. :( Very disappointed with this product and not recommended.