Why is the ground line on the wall at the door of my bathroom black?

The water pressure in your house is not enough, and all of our houses have only one way of water intake, which will affect each other because the horizontal position of the two faucets is not the same.

It is likely that there is a problem with your floor drain, and the water flows between the floor slab and the tile layer between the cement building, because the bathroom is waterproof, so it will flow in the direction of the living room, causing the downstairs living room to leak. >>>More

Have you had it all day or have you used something?

If there is a leak on the top of the bathroom, the preliminary judgment is the sewer pipe, to make sure that the top must be opened, to see if the sewer pipe is dripping, or the waterproof of your bathroom is not done, and the ground has water seeping down, if the bathroom has a buried pipe with water, this reason is shaken and considered, as for the leakage point of the living room, is it leaking near the outer wall, or the wall connected by the two unit buildings, whether there is a ceiling in the living room, and the leakage point can be seen visually.

It should be that the buried water pipe is leaking, and the waterproofing is not good enough, so you should ask the person who does the pipe to dig up and repair it, more information, better advice, and provide free technical advice on concrete waterproof leakage water repair, so as to avoid the trouble of repairing today, leaking tomorrow, repairing every year, and leaking every year.