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Some newer toilets are equipped with more modern one-piece floats (also sometimes known as “floating cups”) instead of the older ball-and-arm design. These types of floats have been engineered as solid cylinders fitted to the shaft of the fill valve itself. If you have a fill valve with a cylinder float, you can adjust the water level in your toilet in just a few seconds. Cylinder valves are easy to install, remove and perform maintenance on, and more user-friendly for individuals less experienced with home repairs. Remove the lid from the tank and set it aside on a flat surface, like a table. Be careful not to drop the lid or set it near the edge of a surface, as most toilet lids are ceramic and break easily. After the toilet lid is removed, check the water level—if it seems higher or lower than 1–2 inches (2.5–5.1 cm) below the fill valve and overflow tube, it may need adjustments. Locate the external water valve on the wall—it should be behind your toilet, beneath the bowl. Rotate the knob clockwise as far as it will go. When it won't go any farther, flush the toilet and continue flushing until the tank is empty. The adjustment stem is a long, slender tube that connects to the larger fill valve. In most models, it will either run parallel with the valve or extend horizontally out from the top. The adjustment stem is used to increase or decrease the amount of water in the tank. Familiarize yourself with the mechanisms inside your toilet tank before making any drastic changes. Refer to the instruction manual or manufacturer's website if available. Some cylinder floats can be positioned by squeezing a release clip on the float itself and raising or lowering it to the desired height. Raising the dial will raise the water level, and lowering it should lower the water level. If your float has a release clip, squeeze it to adjust it to the desired height. If not, however, you will need to locate the toilet's adjustment dial. Use 2 fingers to grasp the notched dial on the end of the stem. Twist the stem clockwise or counterclockwise a full rotation—clockwise to lower the height or counterclockwise to raise it. Once you’ve found a suitable height for the float, replace the toilet lid and turn the water valve back on.  If you’re having trouble turning the adjustment stem, check for a screwdriver notch. Some adjustment dials are secured by screws.  Do not turn the notch more than 1 full rotation at a time. If your toilet water level is adjusted too suddenly, it can cause inconsistent flushing. Flush the toilet a couple of times to check whether the water level in the bowl has lowered or risen. The bowl should be about halfway full. If not, continue fine-tuning the float until you reach your desired height. Call a plumber if, after several adjustments, the level still seems off.
Identify the cylinder float. Lift off the toilet tank lid. Turn off the water supply before you work on the float. Locate the adjustment stem on the side of the float. Check for a release clip on the float. Raise or lower the float 1⁄2 inch (1.3 cm). Test the toilet level height after you have turned the water valve on.