There should be no need to iodide (not iodine) if you use a decent marine salt.
Iodine appears to have a synergistic relationship with bromide/bromine.
A decent marine salt will have 60-65 ppm. of Br.
Using a marine salt that contains Br only as an impurity (5-8 ppm.) then dosing Iodide can do far more harm than good.
Some brands of Iodide supplements are so watered down, it is generally agreed to be a needless waste of money to use them.
There can be closed marine systems that can beneift from controlled dosing of iodide (I).
It is essential to understand exactly which organisms might benefit from enhanced levels of iodide. Then using a salt water medium that contains Br at NSW levels (65 ppm.) and having the ability to accurately test for iodide or any other additive selected for use.
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