I was thinking of using rain water to top of my pond due to evaporation
and or water changes. Is there an easy way to do this? I have some 5
gallon buckets, but I want more volume. I was thinking of using my
metal roof as a collector. Does anyone do this? Is there any harm in
using rain water instead to tap water with chlorimine? I have a few
Koi and goldfish and I don't want them harmed.