Will the total flow of water in the toilet tank be a waste of water?

Usually not.

Under normal circumstances, because of the presence of water pressure, the water will not flow back into the water tank, let alone into the water pipe. If the water tank inlet pipe is lower than the water level of the water tank, sometimes there is a local vacuum in the water pipe after the water is stopped, and the negative pressure generated will pump the water in the toilet tank into the water pipe, and it is best to install a check valve on the water pipe on the water tank, so that there will be no problem of water backflow in the water tank. Hope this helps. >>>More

The failure of the main gate will not be able to control the amount of water, which will lead to excessive water pressure, and the excessive water pressure will test the interface of each water pipe and the faucet, such as the faucet is open and the water is very large and rushed out, so that the faucet is easy to break, and the various interfaces of the water pipe will also be easy to break, if the main sluice fails, but the water pressure is not large, it is okay, but it is not easy to stop the water when the faucet is replaced.

The toilet and water tank are full of running water! However, the toilet tank is generally not cleaned, so the water is not very clean!

If you install a check valve, you will definitely not be able to go back. >>>More

If there is a sound of running water all the time, it means that there is a water leak and water will be wasted. >>>More