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Thanks for your advises. My agency as decided to call in a contractor since I have been too busy with other properties. The contractor claim that the drain pipe needs to be repipe because it's too long (about 12'). The drain pipe is well insolated and it as been working well for the past five years or so. It seems like this problem would have happen before if this would be the case. What do you mean when you say that it might need a shot of nitrogen?