Frequently asked questions about liquid waste

A: For a family of 4, approximately every 3–5 years. This is to remove the build up of sludge in your tank—allowing your waste fluid to flow through the trenches, minimising blockages. A plumber regularly checks treatment plants such as Aqua-novas and he will let you know when it will need to be pumped out.

A: Septic tanks use an enzyme to break down the waste so that it can pass through the filtration trench—chemicals and medicines can kill this enzyme causing the tank to smell and not break down the waste. Other things such as baby diapers and sanitary pads can cause blockages if frequently disposed into the system. Tree roots are another concern when they are planted too close to the trenches. The roots break through the trenches in search of water and will grow inside the pipe causing it to block over time requiring major repair.

A: It can last up to 40 years to nearly indefinitely if made with good quality concrete. Poor quality concrete or acidic ground water can result in deterioration of baffles and tank components.

A: Yes it’s normal for it to smell a bit until the bacterial colony redevelops.

A: Hydro excavation uses water to dig into the soil, which is less harmful than the traditional techniques. It works by using water to break the soil apart and create a slurry, which then is vacuumed into a debris tank for disposal.

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