I have one of the high-end American Standard toilets. The Champion ABFS flush valve that came with it was a pain in the butt to flush. Hard for the kids to make it work and had so much suction that it scared the bejeebers out of older folks. A friend who works at a plumbing supply place gave me a replacement tower, not the champion, that supposedly solves the problem. Well, it is easier to flush, but it never stops running now. My water bill was $60 higher after the first month with that in place.
I'm putting the original flush valve back in, but does anyone have a solution? The flush valve is a Champion ABFS, part # 3175.002-0070A