I thought humans had perfected toilets a long time ago but apparently not. I have only two toilets in my house and it seems like every year or two I have to replace one of these fill/shutoff assemblies.The problem is that the float sticks after a while and then it won't shut the water off properly.I have well water and after a while there accumulates a dark orange "gunk" in the water. Perhaps that's to blame. Maybe it builds up on the float or the rod that the float rides on?In any case, a lot of people in this country have well water and there should be a solution out there that works for us folks.Years ago I remember toilets that had ball valves that were on a metal rod. They never seemed to go wrong. Maybe it's because I wasn't the one who had to fix them? In any case, I wish I could find something that lasted a bit longer.