magnesium in 2nd chamber

I read an article about pulling magnesium in the 2nd chamber of a CA reator. It did provide much detail about what material they used or how much. Do any of you put magnesium in the 2nd chamber? If so, how much and what material?
 
Check out Zeo Mag. Ot can be put in the first chamber as well. I have never used it, but it sounds like a good product.
 
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