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Re: [APD] Chelating Agents

>are way too complicated to distill into some amateur theory - there is 
>pH, dissolved oxygen levels, substrate interaction, humic compound 
>interactions, and on and on, and lastly chelation.  Iron is involved in 
>all sorts of very complex equilbria, even without a chelating agent, I 
>don't think this discussion is helpful or relevant.

Probably not, but it's fun. As one data point water comes out of my tap 
at about .25 ml/L ferric. The plants in my tanks eat this up and the iron
goes to zero pretty quickly.


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