Over time hair, soap and other debris can build up in the drain.
Off the shelf/domestic drain cleaners are not always able to clear the muck that has built up in the drains, and if you are on a septic system, you are limited to the products that you can use.
Consult your blocked drain expert in Maitland and the Hunter Valley
Fitzgerald Plumbing can inspect the drains, locate any issues, and clean troublesome areas. Or if need be, replace the trap component.