How to adjust the water level in toilet pit?

if the water level in the pit is to be lowered, open the water inlet valve on the left side of the water tank cover, and there is a thin hose called a water supply pipe, which is usually inserted into the drain valve on the right side. Just pull the right side up and pull it directly into the water tank. This way, the water level in the pit will not be too high next time when the water enters. If you want to lower the water level in the water tank, there is a screw rod at the top of the left inlet valve, and then turn the knob counterclockwise to lower the level. In this way, the water level of the water tank can be lowered when the water is supplied next time.