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Safe copper levels?
I've had problems with plants growing poorly in my tap water and wondered if
it was caused by high copper levels. I recently measured the levels and
found 1-3 ppm. Is this high enough to cause problems? Does anyone know what
a reasonably safe copper level is? What plants that are particularly copper
intolerant? Any plants that like high Cu levels? And lastly, is there any
way to remove copper from tap water?