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It is advisable to add a vacuum pump so that the water can be delivered to the 2nd floor.
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No, the tank is not high enough, put the water tank on your highest place, the higher the better, the current water tank is not used.
It is inconvenient to use a water pump.
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The pump is pumped up, and it is better to install a small water tank.
Start by finding the occupants on the third floor. Tell him about the water leak in your home. Then find a property company to help you deal with this. After the property company came up with an opinion. The family on the third floor is going to take care of their bathroom.
It's obvious that you are out, because your problems caused the damage to his house, and the neighbor who is good to talk to is okay... If you don't speak well, you need to pay for the rectification of lost work.
It's a good idea to implement the plan, which can be cumbersome, and some problems will arise during on-site construction.
Go to the second floor first to see what is going on, generally this is a matter between the owners, it is best to negotiate and solve, even if you find the property, the property will not compensate you, but only play a role in regulation.
Add a few supporting structures and lay the cushion plate on the top.