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It can only be dredged professionally, and it is likely that something is blocked inside.
Yes, if there is an agreement in the contract, it must be executed in accordance with the contract, and if there is a breach of contract in the later stage, you can request rework.
As long as the tiles are clean, there will be non-slip - usually pay attention not to have particles and debris, etc., if it is often not dry, prevent PVC carpet mats.
It's not easy to do. Demolition of part of the renovation. Fix the pipe at the leaking point.
There's nothing you can do about it, except to mow the ground. >>>More
If it is waterproof, then you need to carefully check whether it has been damaged by you. If it hasn't been broken by you, it's up to the developers to fix it. If it turns out that you broke the waterproof. >>>More