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LaMotte and Hach tell their kits don't test for chelated iron.
So what's the deal here? The people at Hach said there are -NO- tests
available to the hobbyist that will test for chelated iron. So what's the
deal here? When trying to get that 0.1 ppm when doing the PMDD method, what
is really being tested? Is this number a proxy for something else, or does
the chelated iron become unchelated quickly enough that the test is still
valid? And finally, given the choices of LaMotte, Hach, Seachem et al., which
is best in terms of accuracy and ease of use?
Thanks for your help,