Southern Tanks is South Australia's Choice For Quality Water Tanks. Poly & Steel. Large & Small. Round & Slimline. As well as the largest range and the very best prices, we're committed to providing our customers with outstanding service and expert advice. Please browse our site or contact us today if we can help in any way. Whatever your project's need, we'll have a quality and cost effective water tank solution to suit. That's our promise to you.