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air vents for commodes

We had this house built in 1972 and one of the bathroom's commode never flushed properly. It takes at least two flushes to empty the contents in most instances. Could this be an indicator that it needs an air vent, and where do you install it, if that is the problem.

dj1
Re: air vents for commodes

It could.

But start with clearing the drain, as you may have an obstruction in your drain line or in the trap (it's built in the bowl). Chances are that freeing the line will solve the problem.

For the bowl use a toilet snake, so you don't ruin the porcelain.

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