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Hi Bahco, there is definitely no blockage, I have just cleaned them thoroughly with drain rods. Where would I find the air vent? I live in a bungalow and the toilet / bathroom is the original configuration from when I moved in. I can't see any type of vent!! Lianne

I am about to change the WC, as part of a bathroom re-fit. We have a problem with the current toilet that I would like to eradicate at the same time. As the toilet is on the ground floor, when we have periods of heavy rain the water level in the toilet bowl rises. Is there any type of non-return...