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Insecticides should also pay attention to hygiene, do not leave sewage, mosquitoes prefer to lay eggs on the water.
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I also found out tonight that it was so disgusting that I hadn't cleaned the bathroom in a long time.
The best way to do this is to remove it all and rebuild it: first tamp the floor, then make it waterproof. Either deal with the sinking place: cut off the floor tiles, tamp the point, expand the area slightly, make it waterproof, and finally lay flat bricks.
Normal, because the bathroom is waterproof, and then the water vapor is relatively large, the bathroom tiles are also ceramic tiles, not porcelain tiles, so it is normal for the back of the tiles to have stagnant water!
This is a tide bug, that is, the bathroom is too damp and there is no other harm. Just keep the ground dry.
Maybe it's a mosquito larvae, right?
It is also possible that larvae of other bugs are located. >>>More
If you want to install the floor drain yourself, I personally do not recommend you to do this, you should find a master in this area to help you install, and secondly, you should often dredge the sewer when you use it often, so as not to give the sewer a hidden danger of blockage.