Hi
I’ve just installed a new bathroom but when emptying the sink the bath trap gurgles. The sink, shower & bath are all on the same run to the soil stack.
I've installed an air admittance valve under the sink, this has reduced the gurgling but not stopped it completely.
The shower trap also use to gurgle but I've installed a HepVo valve (water less trap) on the shower tray so this no longer gurgles or back fills.
The old bathroom did not have a shower but the bath was (and is) slow in draining. Any ideas what is causing this or how to resolve it? Do you think my stack is part blocked?
Thanks for your help
