When we flush the toilet the bathtub gurgles ,not all the time but most of the time

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Originally Posted by corryv

When we flush the toilet the bathtub gurgles ,not all the time but most of the time

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This indicates a clogged vent. The toilet's venting through the tub trap.
The solution would be to snake from the lavatory roof vent. Put down enough cable to reach the base and 15 feet more. Good luck, Tom