Metal/Steel tanks have been popular for years and continued development of new colours, shapes and sizes has ensured they still are. Some years ago they were made from rolled sheets of galvanised iron and rivetted and soldered to prevent leaking. They were the backbone of water storage the world over. Now the plain metal tanks are typically made from Zincalume®, and the coloured tanks are made from a special type of Colorbond® steel - AQUAPLATE®.

There are some very important factors to understand when it comes to metal/steel tanks. In the past the humble tin tank has been described as a "galvanised tank". Galvanising is the process of applying metal to metal and the "galvanised tank" is made from zinc galvanised to steel. These "galvanised" tanks could be soldered. Solder consists of a combination of lead & tin which is melted with a hot iron and applied to a joint was prepared with spirits of salts. These metals were similar to each other, deemed compatible and adhered to each other under heat.

Then along came Zincalume®, a high tensile roofing product that revolutionised the roofing industry, it was strong, came in long one-piece sheets that reached from the roof ridge to the gutter without a join.
The emergence of Zincalume® (primarily a zinc and aluminium mix of metals "galvanised" to steel) as a popular roofing material brought problems for the trusty galvanised water tank. In the early days there were instances where new Zincalume® roofs were installed and within months the galvanised water tank had rusted out. The tank would break out in brown freckles and in a short time the freckles would begin to join up and the tank would collapse and the owners would then realise that the freckles were rust. The freckles/rust were caused by electrolysis. Electrolysis is a result of metals of opposing make up being joined together, in this case with water, which then creates an electrical field like a battery. The electrolytic action corrodes away the less noble of the two metals and in this case the galvanised tank.
Nowadays electrolysis is still possible where a building still has a galvanised (zinc) roof which supplies water to a Zincalume® tanks.

Extremely strong tanks with polyethylene tank linings to prevent corrosion and ensure water quality.
Site Preparation : A concrete base is required or an approved tank stand
In Ground : No
Guarantee : Ask your supplier for a written guarantee for both the material & the workmanship.
Repairable : Yes, seams can be resealed by the manufacturer.