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re: Iron (was What is the best liquid fertilizer)
> I can accept that your iron is getting used up, but not that it won't stay in
> the water column. Iron is one of the few things that comes in my tap water,
> the others being Ca, Mg, Na, CO3, silicate, and chloride. It's pretty pure
> stuff. The Fe comes in at 0.6ppm. If I leave the water in a bucket for a
> week, or sitting in an empty tank for a week, the Fe is still at 0.6ppm.
But is the iron still available to the plants after a day or two? Doesn't
it oxidize?