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If you have backup valve and water is not coming from the public sewage, probably the main drainout is plugged, if you haven't dropped anything in, it could be that construction waste was left inside during house construction,try contact the builder see if you can make them move to do some investigation.
ceramistpalace 发表于 2014-6-1 21:11 % n' N5 @- h0 ]# d, e5 E7 aIf you have backup valve and water is not coming from the public sewage, probably the main drainou ...