The bathroom leaks downstairs along the toilet floor drain and the drain from the washbasin

First 1 find a plumber to do a closed pressure test to see if the water pipe is leaking, or which faucet is connected to the wall, the angle valve or something is not tightened, along the wall and between the tiles, the water flows down, if it is convenient, the floor heating or heating is also turned to see if these two leaks.

2 If the first item is sure that there is no problem, disassemble the bathroom gusset to see if there is a leak upstairs down the sewer pipe and leak downstairs to your house and whether it is a leak in the bathroom next door to the wall, and the result is that his house is very waterproof and flows to your house through the wall.

3 If the first two steps are fine, remove the toilet to see if the sealing treatment of the double toilet mouth is not done well When you re-install the toilet, remember to use glass glue to beat the tile joints under the toilet so that the bottom of the toilet is a sealed environment and don't use all the sewer including washing machines, showers, and wash basins to see if these sewers have been changed and leaked down.

4 If the first three items are okay and the downstairs is still leaking, I didn't say that at least your home waterproof is definitely not good, and it is also a problem to take a bath in the future, so it can only be planed off, redone waterproofing, and re-tiling.

5 If it still can't be solved, it is recommended that the landlord beat him downstairs and tell him that the water will leak.