I have a 25 year old toilet that worked well for 20 years. For the last 5 or so, it frequently leaves floaters behind! I'm baffled by the change, because it's not any of the issues you might tend to think it would be. It's not clogged and the water flushes down in a nice funnel action in a short amount of time. It flushes beautifully. The issue seems to be that, when flushed, the tank empties too quickly into the bowl. Since there is no clog, the water level rises slightly, and the toilet starts flushing right away, but the water is swirling around in a circle - the floaters with it.. Then, once the back tank is empty, the funnel appears and the rest of the water quickly goes down, while swirling. The problem seems to be that there is no water left to finish the flush when the water level reaches the bottom and air breaks the vacuum. Looking at other toilets, I notice that when the water level reaches the bottom, there is still more water coming in from the top, so the flushing action continues, driving any floaters downward and into the trap. With this toilet, there is no final push. It seems like I need to slow down the flow of water from the tank to the bowl, so that the funnel appears earlier and there is still some water coming down when the bowl empties. It doesn't seem like it could be the toilet itself, since it used to work fine, and it's clearly not clogged. I'm thinking it has something to do with the mechanism, which I did replace back in time, but I can't see what replacing that will do. The flap opens, the water goes down, and the flap closes when the tank is virtually empty. That operation is like any other toilet I've worked on, and that's been a bunch (I used to be a contractor). I really hate to buy a new toilet because I know this one should work. I'm tempted to buy new guts for it, but I hate to blow $30 and have the same issue. It seems like it needs to release the water from the tank more slowly, but I don't see how to do that. The flap is either opened or it's closed. Does anyone have any ideas?