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Customer has just had a new bathroom fitted. Basin waste runs directly into an unvented soil stack. As a consequence as the basin drains it makes an awful gurgling sound. I have done away with the bottle trap that bathroom installer used and fitted an anti vac pedestal trap. When I left all seemed fine but I have just got home to customer call saying that gurgle is back. I'm now doubting myself, should I have fitted an anti syphon trap.
Cheers
Cheers