Sometime back I had this problem of a smelly toilet. Called several plumbers and they couldn't find the cause. One even inserted a second air vent without success. I even changed it to a second new other make toilet.
As surprising as it may seem there was a defect in the construction/design of the toilet itself. It was allowing an air passage carrying out the bad smell passed the trap.
So beware even when buying a new toilet it may happen that its badly design
As surprising as it may seem there was a defect in the construction/design of the toilet itself. It was allowing an air passage carrying out the bad smell passed the trap.
So beware even when buying a new toilet it may happen that its badly design
))
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