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I own an apartment in a condominium of 4 apartments. we received a registered mail asking us to connect to the mains drainage. We are under the road level. A lift pump is necessary. What are the pitfalls to avoid? As the condominium is on floor floors below they will not have a problem of repression at home if the pump is clogged?

Your question does not specify the cause of the registered mail: decision of general assembly, compliance within the framework of the law on water?
In all cases, it is up to the trustee (professional or not), to mandate a specialized company and / or a design office that, alone, are able to define what type of installation must be implemented. Logically, only the apartments on the ground floor must be connected to a lift pump, not the others.

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