Clean, fresh rain water is the cleanest water falls freely from the sky. Rainwater that does not come in contact with soil does not risk contamination from harmful bacteria, dissolved salts, minerals or heavy metals. (This may not be the case in heavy industrial areas)
Rainwater tanks can still become contaminated by dirt, animals, trees or by your own roof. A
First Flush Diverter can divert the first flow of water from the roof, so that the tank does not collect it.
"Vector" proofing means keeping vermin out of your water supply. Do not allow water to lie around in gutters and keep your gutters clean. Nearby trees can drop leaves that may taint the water that is being collected. There are a variety of leaf catchers and gutter mesh covers available, if trees create a problem.
Most solids from gutters and downpipes are caught by the tank strainer, which must be cleaned out from time to time.
Roofing materials or roof paint may also be a source of contamination. The types of roofing materials most suitable are:
- Colorbond - steel
- Zincalume - steel
- Glazed tiles - well fired
- Concrete tiles
- Clay tiles
- Treated fibro
Note: If you have any other type of roofing material, please seek advice.On newly painted roofs, a special type of paint suitable for the collection of rainwater must be used. This does not contain anti-mould agents, again if in doubt, seek advice.Correct installation will prevent contamination risk.