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Organic and inorganic fine particles that end up on your roof can be washed into your tank when it rains, lowering your rainwater quality or even rendering your supply unfit-for-purpose.
Some particles cause cloudiness as they’re suspended in your rainwater. Others fully dissolve or are too small to see. All can be problematic if they end up in your rainwater supply.
Organic fine particles can be alive (bacteria, viruses, etc.) or come from decomposed vegetation and dead animals. They can also come from food, fur, feathers, faeces, germs and other nasty things pests leave behind.
Inorganic fine particles may come from many kilometres away or from nearby, ending up as “dry depositions” on your roof.
Dry depositions are particles from the atmosphere which are blown onto or which settle on to roof tops (vegetation – leafs, twigs, pollens, bird and animal faeces).
Building materials (especially asbestos and lead flashing, paint and solder) can contaminate your water as they corrode, crack, flake, degrade from UV or leach chemicals.
Road dust and exhaust fumes from the roads in your area can end up as inorganic particles in your system.
Farming and industrial activity can leave hazardous fine particles from dust, soot, heavy metals, pesticides, herbicides and other chemicals.
Salt from sea-spray, desert dust and ash from volcanoes and bushfires can all end up on your roof and in your system.