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It should be mixed with some lime and then filled, pure sand does have hidden dangers, sand will sink when it meets water, and the bathroom is a place where water is constantly flowing all year round
At least it is necessary to connect the live wire and the neutral wire to be considered power-on, and some three-pin plugs need a grounding wire to be safer.
If it is compacted with water, it will not sink and is better than using other fillers.
Due to space constraints, some units have no windows in their bathrooms. Of course, this kind of bathroom is not as good as having windows, but now the bathrooms are all ventilated ducts, open the exhaust fan for exhaust, and the air is OK, and the air quality requirements are not particularly high.
Generally speaking, there is no problem, but if the water leakage is serious, it may flow to other rooms, and there are hidden dangers.
Generally, after waterproofing, you need to wait for one to half a day for the waterproofing coating to dry completely. >>>More