Howdy: I'm a plumber here in western Montana and having to deal with my first automatic Sloan flush valves at a big athletic club that opened up recently. They are having all kinds of problems with them: flush all the time, won't flush at all, dead batteries in a month or two, when they are supposed to last for 3000 flushes. I've taken them apart a dozen times, I've never found any sand or dirt in them. Half the time just disassembling it and reassembling it makes it work for a while. They are on a well and have a very good filter on the incoming water. Any ideas?