If this is happening, it means it's usually a ventilation problem, or there is debris in the pipes. In some cases, it means that there are problems with the plumbing hardware, but this is very rare. If the sink drain gurgles when flushing the toilet, you can easily discover the root of the problem. Gurgling indicates abnormal suction building in the line. The negative air pressure will eventually release, pushing air backward through the drainpipe and into the toilet bowl. When this occurs,... When your toilet bubbles/gurgles every time you flush it, it is a sign that either the drainpipe

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