Interesting gadget. It'll definitely come in handy to someone, but paying $32 a year just for a bit cleaner water in your toilet is not for me. Although, I bet my wife disagrees because our toilet is a yellow ring problem, which is the result of minerals in the water, according to our plumber. Maybe this filter can help keep our toilet bowl snow-white and eliminate the need for me to clean it every two months. As for now, I deal with it using this guide from https://sanitaryreview.com/how-to-get-rid-of-toilet-ring/. It's easy and comprehensive. So if you have the same problem with stains in your toilet - check it out. If it helped me, I think it'll help people who take better care of their toilets.