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1. Go to the balcony on the 7th floor to see if it is dripping water from drying clothes.
2. Is there a water pipe in the balcony floor slab and the water pipe is broken?
3. Find a professional master to see on the spot.
If there are cracks or quality problems, the construction party will repair them.
Suggestion: first find a professional dredge to dredge the lower pipe, and then replace the floor drain with a T-shaped one, so that there will be no backwater. Hope it helps.
If you want the property to go upstairs to negotiate who is in charge, it really doesn't matter, so you can find the civil department to coordinate.
The little moth flies, flies and lays eggs and hatches into larvae.
If there is a lot of pressure and too little water, there will be such a problem.