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If the floor is not high, you can install a sewer pipe outside the balcony by yourself, but do not disturb the downstairs neighbors.
The balcony has no water equipment! There is no need to add drainage! If you need to add drainage, you should first consider whether there is a main pipe that can be discharged, and if you punch a hole, 100
Remove stagnant water....Or sprinkle the drug, and the suspension agent is aimed at the child.
Manholes. Hands can reach in and replace and disassemble the drain.
Both are two, but one of them is sealed, and that is a spare port, and this spare port is used when the position is really not suitable for the other, and of course, that one will be sealed.
It's not cutting corners, the wall of 12 is much better than the wall of 6, this is to save space to do this, it is all cement base, and then plastered with cement on both sides, and when it is dry, you can't smash it with a sledgehammer.