Our plumber (new house) plumbed our 2nd floor laundry with a washer overflow tub that is not hooked into the houses waste line. The PVC waste line comes down into the basement where it terminates into open space - just a pipe hanging out of the ceiling. So should the washing machine overflow the water wont damage the 2nd or 1st floors but will damage the finished basement. The explanation was that plumbing it into the waste line would result in a trap that would dry out allowing sewer gases to enter the house. In my last house, the plumber solved that problem by pouring mineral oil down the train and into the trap - I guess the mineral oil takes longer to evaporate. I am inclined to insist that the plumbing be changed to have that line plumbed into the sewer line. Any thoughts before I do that? Thanks
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Plumbing a washing machine overflow tub