Gully traps backing up often point to problems further down the line. This Boondall property had slow drainage at the outdoor gully and loud gurgling from the bathtub inside. Both symptoms suggested a blockage in the shared waste line. Our plumber used the outdoor inspection point to access the drain and clear the obstruction. S&J Plumbing and Gasfitting checked the flow from multiple fixtures before finishing up. Blocked drain repair that affects more than one outlet usually means the blockage sits past where the lines join. The gully now drains freely and the gurgling has stopped. Book a visit if your drains are acting up.