Cleaned out long horizontal run PVC drain pipe from kitchen heavily clogged with calcium. Used vinegar to soften and then cut pipe and jetted from low end. Now have calcium clog after vertical stack in 4" pipe under slab. Location approx 10' after vertical based on basement bathroom fixture flow. Used 30% vinegar fed through shower pan drain near clog and broke through. Problem is that after breakthrough, have limited size passage and gravity will mean only have small diameter passage....
Hard water calcium clog under slab
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