If your at home this could take some fine tuning but iif in an appartment try throttling down on the valve while running water and see if it is just cause by excessive pressure.
by peeing and pooin in it.
A toliet uses 7 to 8 lites per flush!
Modern toilets are are all adapted to a 13 litre flush. Some also have a button giving the option of a 6 litre flush too.
Either the flapper is letting water through or you need to replace your flush valve or there is something stuck between the stop and the flush valve.
Take shorter showers and don't flush the toliet.
The toilet may not flush due to a clog in the pipes, a malfunctioning flush mechanism, or insufficient water in the tank.
5 gallons at least for a home toliet restrants seem to take 3 gallons that's why they are always are out of order who cares how much the water bill is put your toliet at 5 gallons there is more pressure
The toilet may not flush properly due to clogs in the pipes, a faulty flapper or flush valve, low water level in the tank, or a problem with the water pressure.
The hotel toilet may not flush properly due to clogs in the pipes, a malfunctioning flush mechanism, or insufficient water pressure.
The toilet bowl water level is low after a flush because the water is drained out of the bowl and into the sewer pipes during the flushing process.
The toilet may not flush with force due to a clog in the pipes, a problem with the flushing mechanism, or insufficient water pressure.
The toilet may not flush completely due to a clog in the pipes, a faulty flapper or flush valve, insufficient water pressure, or a problem with the toilet's design.