Posted: 11/08/2013 at 13:15
Returning to the original post. We have used water that is two year's old this summer to water the veg. It has been in the water butts that long as we hardly used any of it last year.
It is well covered at all times and is perfectly clear and un-smelly. It comes off a slate roof.
I don't think thirsty plants 'care' where their water comes from. Pond, water butt or tap.