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: