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The volume of water in the tank, its height above the bowl, restrictions or blockages between the tank and the bowl, or within the bowl all limit the speed and amount of work the tank water can perform. If your toilet is less than ten years old, you may have a first generation 1.6 gallon low flush toilet. These toilets were mandated by the 1992 Energy Policy Act in an effort to save water. Traditional toilets used 3.5 gallons of water per flush.
Adjust the Toilet Fill Valve Water Level. The water level line should be marked by the toilet manufacturer on the back of the tank. If not, the water level should be about 1 inch below the top of the overflow pipe. To raise or lower the water level in the toilet tank, turn the adjustment screw on the toilet fill valve. The screw and rod controls the distance between the valve arm and the float cup. Flush the toilet to verify the final water level. Check the connections again and after one hour to be certain there are no leaks.