pcduck said:Oh ok THG.
I can understand that pollution settling down, but even then unless you live next to a smelter or similar this pollution would be negligible. The amount of rainwater that comes off a roof is quite a bit more then what people realize. There is a mathematical formula to find the amount, by knowing the sqft and the amount of rainfall.
If still concerned just do not use the water in the very bottom of the rain barrel. You should be able to see this pollution build up in the bottom of the barrel.
But there again:doh: if your outside pollution is so bad that you are unable to grow anything outdoors, I would not use the rain water either.
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