Since installing a new dual-flush toilet we now hear a loud gurgling noise in the kitchen sink which is about 15 feet from the toilet. Any idea what's causing this and what could be done to stop it?

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we now hear a loud gurgling noise in the kitchen sink]

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The sound you hear is the system attempting to vent through the kitchen sink trap. This indicates a blocked vent. The solution would be to snake the roof vents. Put out enough snake to reach the base and 15 feet more. Good luck, Tom