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The presence of ash and debris in rainwater is unlikely to be a health risk, but could affect the appearance and taste. Fire retardants currently used in Australia are of low toxicity, but may also affect the appearance and taste of rainwater.
To be 100% sure of your water supply we would recommend that the water in each case be tested by a certified laboratory before drinking, including testing for Arsenic and Chromium.
Dural Irrigation in partnership with Puretec recommend a dual stage filtration system to remove sediment, odours and bacteria from your water supply creating safe drinking water.
For sediment/ash removal, we suggest a 5 to 20 micron PL Series Pleated Sediment cartridge, and for smoke smell/taste we would recommend an activated CB Series Silver Impregnated Carbon cartridge.
In addition to filtration we recommend treating your tank water due to potentially increased bacteria in your supply. Odour and discoloration are the main signs you my have bacteria or organic matter in your tank.
Puretec TankSafe is a rain tank purifier that can kill up to 99.9% of all germs, bacteria and viruses in your rainwater.
We would also point out that filters may need to be changed more frequently, due to the higher than usual content of contaminants.
Puretec Group Australia