How to Change the Water Level in a Toilet Tank
The water level in a toilet tank affects the way the toilet flushes. If the level is high, the toilet flushes with more swirl and force than if the level is lower. To change the water level, you adjust the float valve that regulates the flow of water to the tank. Float valves are manufactured in two basic styles: ball-cock valves and concentric valves. To change the water level, the first step is removing the tank’s cover to access the valve and locate the adjustment mechanism.
1. Push down by hand on the ball float that is attached to the outer end of the rod. If you hear water run, use the adjustment screw at the inner end of the rod to raise the water level in the tank.
2. Turn the vertical adjuster screw at the top of the valve where the rod connects counterclockwise to raise the water level. Lift the ball with one hand and turn the screw one full rotation with a screwdriver with the other hand. Allow the ball to float and wait until the water stops running.
3. Flush the toilet and observe the power of the flush. Allow the tank to refill as you turn the adjustment screw counterclockwise, if desired, for more flushing power. If the water does not shut off automatically, the adjustment has passed the maximum level. Turn the screw clockwise a full turn and flush the toilet again. Adjust the valve so the water shuts off with the float in the highest possible position.
1. Flush the toilet and identify the concentric float that travels down and up on the stem of the valve at the left, inside the tank. Note the valve arm with attached adjustment rod at the top of the stem. Allow the tank to fill until the water shuts off.
2. Loosen the small nut on the upper end of the adjustment rod with pliers. Unscrew the nut several rotations by hand. Turn the rod clockwise by hand to raise the level of the float and water. Typically, two or three full rotations will make a difference. Tighten the nut with pliers so it is snug.
3. Flush the toilet and observe the power of the flush. Allow the tank to fill until the water shuts off. Repeat the procedure to adjust the float and water level, if desired.
Things You Will Need
Refer to the owner's manual or the manufacturer's website for instructions to remove the tank cover on toilets with quick-flush buttons on the cover.
Do not over-tighten the adjustment screw on a ball-cock valve. Over-tightening risks damaging the valve and the internal diaphragm.