They both work and are fine to use to maintain alk and calcium. BRS is cheaper.![]()
Perhaps the alk part of B-Ionic is a blend of sodium bicarbonate & sodium carbonate where as BRS has two recipes where you use one or the other or you can blend them if you like.
For both products the calcium part is calcium chloride.
If you can post what you are referring to it will help. I don't believe ESV can add enough mag without precipitation to their calcium chloride unless they cut back on the amount of calcium added. If ESV added mag to their alk part, it would precipitate out.
All your calcium and alk supplements do contain some contaminates especially in the calcium chloride, which are the trace elements. FWIW, I would not want more trace elements added other than those present as contaminates, since the trace elements are high already in reef aquariums according to what research we do have.
Weak fluorescent pigmentation can indicate low trace element concentration. Bleaching and excessive mucus secretion can indicate trace metal intoxication.
The recipe given above has been republished by Renke (1999) complemented with additional molybdenum, strontium, iron and manganese for better growth of corallinaceous algae and again in 2001 (Renke, 2001) with additional calculations.
This repeated publication of the recipe in German aquariophilic newspapers and homepages initiated the development of several commercial trace element mixtures with widespread use. The different commercial trace element mixtures competed for the induction of brighter colouring of corals which finally led to a mode of trace element addition that induces a controlled bleaching