Sometimes, the main house drainpipe is not clogged but just the one connecting the bathtub and toilet. This is the main reason why toilets bubble when a bathtub is draining. The displaced air will force its way out through the bottom of the toilet bowl. When you start draining the bathtub, the water will displace the air in the drainpipe. Since a vacuum cannot exist, the space in the drainpipe between the clog and the bathtub will be full of air. The bathtub drain gurgles when the toilet is flushed.The toilet is bubbling and won’t flush.The toilet bubbles when the washer drains.You might, therefore, notice that the toilet bubbles when flushed or: If the main house drainpipe is clogged, you will definitely have a problem with all the fixtures. Each branch represents a single fixture that drains into the main house drainpipe, in this case, the tree trunk. A tree has several branches and one trunk. ![]() Think of a house plumbing structure like a tree. ![]() A problem with one fixture’s drainage will directly affect the other fixture. Due to their close proximity, they also share the same vent stack. This causes negative air pressure inside the drainpipe/vent, which is forced out through the toilet in the form of bubbles.Īlthough a toilet and a bathtub are independent fixtures, their drainpipes are joined together in the main house drainpipe. If your toilet bubbles when you drain your bathtub, it is a sign that the drainpipe or vent stack is clogged. When you notice your toilet bubbling/gurgling any time you drain your bathtub, then you need to fix it as soon as possible. ![]() Last Updated on Septemby toilethaven Why Does My Toilet Bubble When I Drain My Tub?Ī proper-function bathtub should not be in any “communication” with the toilet.
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