My problem is the opposite. First of all the flapper remains open for all the water to empty the tank, but then it takes forever for the refill. The water simply takes its time swirling around before a direct flush takes place. Also, I notice my critical level mark is no where near 1" above the overflow pipe as you suggest. The plumber installing this didn't take this into consideration, I guess. And lastly, how do I adjust the clip for the water level. I tried to do this, but I see no change, either up or down. All help would be appreciated.