Septic Tank Cleaning Services from Clarence Valley Septics Clarence Valley view septic systems as biological processes that utilise the microorganisms found in waste. Septic systems eventually need to be pumped out because of the build-up of solids, even under ideal conditions. Pump out intervals vary based on a variety of factors, but it is advised that they be cleaned every 4-6 years. Visit Us At :- https://clarencevalleyseptics.com.au/septic-systems