Randy Holmes-Farley
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if your iodine is low then just dose iodine as recommended that's the whole point of the icp test and making the recommended adjustments. Keep in mind that gfo and carbon deplete iodine
FWIW, I don't think either GFO or GAC bind appreciable iodide or iodate from seawater.
There's no mechanism for them to bind to GFO, and I think the GAC binding idea is a long held misunderstanding of the known fact that GAC readily binds I2 (iodine) in some settings (but recognizing that is not the form primarily present in seawater).