I have a second floor Gerber toilet that I installed 2 years ago with no problems. Lately I have been getting a large air bubble that will come up when the toilet is flushed. If I flush it slowly there is very little air. A second flush after the first has no significant air bubble. I have checked the stack and it appears clear past the outlet of this toilet. There is no leakage that I can detect at the floor seal. I have cleaned all of the water outlets into the bowl with hanger wire and they appear to be clear. It seems that the air is entering the bowl from the larger water jet at the bottom of the bowl and not from the trap side but I am not totally sure.
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