Ive got a bit of a problem with syphoning of the low profile shower trap when draining other appliances on the same run.
The shower trap is at the end of the run, two basins come next (in a single pipe), then bath, and that lot all joins into the soil stack at about the same level that the WC pan joins the stack. Top of stack has an AAV.
Basin draining seems to be sucking at the shower trap. I can fit a small AAV to the basin waste run, after the two basin traps, but before it joins the main run under the floorboards. Would this work?
