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The lack of venting does cause the drains to flow slowly. In your case, mostlikely caused by the stack freezing again. I would suggest you do one or a combination of the following: 1) Insulate the exterior portion of the vent stack. That way it is less likely to freeze during the coldest time of the year (one time fix) 2) Add a heating element around the ...


It's unlikely to damage your pipe, but the problem could be air in the system. You may have an old pipe underground that has a break in it.

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