Tank water collected off your roof through gutters and downpipes, is open to a variety of contaminations: from chemical pollutants in the city, through to leaves, dirt and animal droppings.
In some areas birds and bats feeding from overhanging fruit trees, can pollute tank water very quickly.
Leaf matter and some common tree species are renowned for causing tannin colour in tank water.
Problems with corrosion of metal pipes and fittings can also be encountered with tank water as rain water is naturally acidic.
There are various methods for eliminating contaminants from the drinking water. These range from boiling the water for 10 minutes through to micro-filtration, ultraviolet and ozonation.
Common problems & associated treatments:
- Bacterial Contamination – Bacteria is present anywhere that organic matter is breaking down. Even if the water looks, smells and tastes okay, bacteria can still be present.Parasitic Contamination – Animal droppings are the primary source of parasites in tank water. Giardia and cryptosporidium…Colour & Odour – Colour in tank water is usually caused by the tannin in the leaf matter on your roof. Odour is generally caused by the bacterial activity in the tank.Sediment – Sediment size ranges from large visible particles to particles that can’t be seen with the naked eye. These particles can act as vehicles for other contaminants like parasites and bacteria. Colour in your water (eg tannin) is usually caused by tiny sediment particles as well.