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Copper in PMDD

A few days ago a member of this list (sorry, I did not save the message
and I do not remember the name) wrote about his decision to use a
pre-made fertilizer for various reasons, including not to have to worry
about the levels of copper in the PMDD formula. I do not have of course
any problem with people that decide to use, for whatever reason,
reliable pre-made fertilizers. However, I would like to clarify that the
original PMDD recipe has an excellent margin of safety concerning copper
toxicity. Problems may occur (this is an hypothesis not accepted by
everyone, by the way) if the original ingredient doses are changed by
using commercially available mixes with elevated copper content. I just
do not want the original PMDD being "tagged" with issues that do not
affect it, but rather apply to some of its variations.