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"On the other hand, i get the feeling that what you mean by "return" line is perhaps a short waste arm from the sink drain to the main branch line in your bathroom."
You are right on this guess. Sorry for my knowledge in plumbing terminology. Based on your info, i guess there is no equipment to detect my waste line problem. Am I correct? I think there is only small percent of plumber can offord this kind of expensive equipments.
Do you personally use this kind of detection before?
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