They do offer adjustable flaps at the local Lowes, Home Depot or Hardware store that have an adjustment on the flap for regulating water flow. Set the new flap, which your install in under ten minutes to allow more water to flow into the tank, thus tidal waving your giant turd into the the unknown depths of septic heaven. The theory is to reduce the weight of the rubber flap and/or getting the flap to float longer before it cuts off the flow of flush water.
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