In these cases, the gullies and soakaways may be working but just need time to be able to cope with the levels of water run off. To use this feature you must be signed-in to your account, please. It started to bubble and i thought 'oh it's working'," she said. What type of tradesperson do you need? Sanitary plumbers who are registered with sps, and hold, minimally, a builder certificate or other relevant qualifications acceptable to.