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The piping has soap scum build up along with other debris like lint and then bacteria starts growing cause the odor .To properly clean the lines one should water Jet NOT snake the lines to restore full flow and remove the deposits

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Q: Why is there a musty smell from laundry drain pipe?
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Can you use an existing tub drain for your laundry also with same vent pipe?

It needs aleast a 2 in. pipe. tubs are 1.5 in.


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The laundry waste pipe is fitted to the main drain near the toilet and the main pipe down the line past toilet is partly plugged, forcing the laundry waste up the toilet waste tube. You need to auger the pipe from toilet to outside. If all the piping is in ground you will have to remove toilet from floor to do this properly.


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