Thanks for the responses.
I don't remember the TDS of our city water but a couple years ago I put a
misting system on a timer when the temps were forecast over 100 deg. for
several weeks and the plants were just coated with mineral spots. I was a
real pain to get them cleaned up. I'm expanding my rain harvesting for next
year and going to use it for misting.

Thanks again and Merry Christmas.

"Steve" wrote in message
...
I used to collect rain water in the fall and store it in gallon milk jugs
for use over the winter. They were stored about 10 feet from the grow
lights in my basement. A few of them would turn slightly green but that
did not seem to be a problem.
I stopped collecting rain water when I found out a friend had a TDS meter.
Distilled water gave a reading of zero, my rain water gave a reading of 4
and, as I recall, my tap water gave a reading of 11. It turns out I was
wasting my time collecting rain.

Steve


Mark_OK wrote:
Hey all,

Should I have any concerns about keeping rain water stored over winter
for the orchids? I keep it in the same room and covered. No bad odors
but it does have a slight green tinge.

Thanks.

Mark