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Go buy a bottle of canal water, and you can sell it in the daily commodity area.
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Go to the supermarket and buy a solvent to unclog the water pipes, it's very useful.
It can be dredged directly with a steel wire dredge of more than 3 meters, which is usually caused by too much hair.
Good FRP, or plastic steel, must be waterproof. 、、Forget to adopt.
If the decoration is still there, you can use the air pump to add water to open it, if it is blocked in use, find the property department to dredge, and the drainage outlet of the whole bath room should be exposed to the ground to dredge
This is very scientific and does not need to be improved, unless two are launched together, it will drain faster than a normal floor drain, because one drains the other and the air can be removed.