How did I not know about this?! They do exactly what they advertise. Our hard water has caused all the toilets in the house to have a hard water ring that won't come off ---- until now. This device also works in showers that have developed hard water stains over time. Looks like I just installed new toilets! That's great. I have a note. It's like nails on a board! I have to put my headphones on and turn up the volume of the music so I don't hear the crunch. It's torture without it. Great product, but beware of the "Ahhhh!" factor!
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