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It is to isolate the smell in the sewer, because there will be some water in the recess to isolate the air.
One of the bathroom drains is curved, may I ask why, I see that the upstairs and downstairs are straight >>>More
Waterproofing cement mortar.
Wrap a layer of styrofoam (soft and hard). The method is that you can refer to the wrapping of the open piping of the chemical plant.
Pipes are generally 6 meters each. That is to say, generally speaking, the longest length of various pipes used in construction is 6 meters, and then various connections.
If there is water at the reverse bend, it is normal, and there should be no water in the other horizontal pipes - the installation should have a slope. If the water accumulation is not serious, it will not affect the use!