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Thanks for the suggestions all. What
I am really after is whether or not tannic acid is toxic to orchids? Would
putting the water through a Brita type filter remove enough of the acid? Short
of melting snow or buying water (would much rather put the $ into plants!), this
is my best source for 'pure' water. Perhaps my tap water left to sit would be
the best alternative, even though it is very hard and the ph needs to be
lowered. I am aiming for a ph in the water of about 6. Is that the right
goal?
Thanks again
Sharon
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