Twenty eight floors, the first floor of the purchase is ready to decorate the bathroom backwater, wh

Whoever asserts, who adduces. You have to come up with the contract to speak, whether it is independent or not. It's just what the salesperson said, it's useless.

It doesn't matter what he says when buying a house, what matters is whether the salesperson dares to write it into the contract. The current method is to urge the property to be drained, and the property must be connected to the well at least once a year, and the septic tank should be dug once. You can organise and join an owners' committee, and you can oversee the property to do that.

They can say whatever they want, they want to come up with evidence, do they have drawings, if the sales statement is not nonsense, it is according to the original design drawings, then if what he said is true, you should ask the property if it was modified, and if it was modified, find out who is responsible for it.

The salesman lied to you in order to sell the house, and there is no need for the property to hide it from you.

Generally, it will not, unless the upstairs throws all kinds of garbage into the sewer to block the sewer pipe, generally this kind of thing rarely happens, the first floor is an independent sewer, so to block the second floor, don't worry too much about the probability of blockage, this probability is very low.

You should find a developer for this, and they are only responsible for water, electricity, sanitation, and the image of the community.