TANK SELECTION CRITERIA


RAINWATER HARVESTING

Roof Material Galvanised tank Galvanised tank with liner Plastic tank with corrugated sleeve
Roof zincalume No Yes Yes
Roof chromadek No Yes Yes
Roof galvanised steel Yes Optional Optional
Roof tile Yes Optional Optional

 

BOREHOLE WATER

PH Galvanised tank Galvanised tank with liner Plastic tank with corrugated sleeve
Below 6 No Yes Yes
Above 11 No Yes Yes
Soft – less than 50mg/litre Calcium Carbonate No Yes Yes
Acid mine water No Yes Yes

 

OTHER CONSIDERATIONS

Water Temp Galvanised tank Galvanised tank with liner Stainless Steel Tank Plastic tank with corrugated sleeve
More than 55℃ No Yes Yes No
Grey Water No Yes Yes Yes

IF TANK IS:

  • in a high air pollution area: paint outside of tank to prevent corrosive elements coming into contact with the corrugated steel.
  • close to sea (less than 1 Km): paint outside of tank.

 

INERT CATCHMENT

Certain roofing materials are inert in that they do not react with water falling on their surface. If water flows from an inert surface onto / into a galvanized steel surface, the corrosion of the galvanized steel surface is accelerated.

 

IS MY ROOF / GUTTER / TANK COMBINATION SUITABLE?

Please note there is a difference between various corrugated steel looking roofs.

They are either

  • Galvanized steel
  • Zincalume
  • Chromadek

Galvanized / tiled roofs are compatible with a galvanized tank.

Zincalume & Chromadek roofs/ gutters are inert – we recommend choosing a tank that is painted internally and where overflows are piped away from the tank.

 

HOW DO I KNOW IF MY ROOF / GUTTER IS ZINCALUME / CHROMADEK?

New roofs are likely to be Zincalume / Chromadek while older roofs are generally galvanized steel.

 

MY ROOF TANK COMBO IS INCOMPATABLE

We have two alternatives available to you:

  1. We paint the inside of your tank with a food-grade Polyurethane paint that protects the corrugated steel from the corrosive water.
  2. We can offer you a corrugated sleeve to cover your plastic tank – see sleeves for plastic tanks under our product section