Why Buy a Plastic Tank?
Polyethylene tanks have grown to dominate the Australian water tank market as they are lighter and can be more cost effective than alternative materials. The material ensures pure drinking water with no taint. The manufacturing process of polyethylene tanks has minimal impact on the environment as the process does not release any dangerous chemicals into the atmosphere, creates no noxious gases/odours, and the material is 100% recyclable.
Why Buy a Steel Tank?
Until recently, galvanised steel was the most common material used in the manufacture of rainwater tanks. Galvanised steel is not inherently resistant to corrosion but it is now available with rust resistant coatings. Stainless steel tanks are available and this material is not prone to rust or corrionsion although it is more expensive. Many new steel tanks are made from Aquaplate steel. This material has a food-grade plastic lining bonded to the interior surface of the tank. The environmental impact associated with manufacurting steel tanks is much higher than that of poly tanks but is offset somewhat by their recyclability and longevity.
Why Buy a Concrete Tank?
Concrete tanks are strong and heavy which means they are ideal for underground installation, including loadbearing areas such as beneath driveways. Like their steel counterparts, some concrete tanks have or will need a plastic lining. Concrete tanks can be cast either offsite and delivered to your home or cast onsite. Due to their weight, either option will require considerable preparation. Concrete tanks tend to keep the water cooler than most other tanks, reducing the likelihood of bacterial growth. Although these tanks have high embodied energy (the total amount of energy required for production), a good quality concrete tank will last you decades.