Pro resins, saw that video by BRS. Honestly as of recently, I wouldn't trust squat BRS has to say. They are a company that sells to the reefing community, and as of late they are pushing the gimmick meter to the limit.
Pro line of DI resin, like seriously? What is so pro about it over the regular DI esin that you've been selling for years? Also this new Pharma pouches for bulk chemicals that aren't even bulk anymore and cost twice as much as they used to, and more then likely are the same exact product they used to sell but in a fancy package now.
Yup BRS has become like any other LFS....... Believe me or not, but do some research yourself and you'll see what I'm ranting about.
I'll take it a step further and say that offering pharm grade compounds, and pricing them as such, has exactly what benefit for reef tanks? Impurity levels in food grade compounds are incredibly low and, well...let's face it, the #1 impurity in most compounds is H2O. People see "˜impurity' and their brains go right to "˜toxin'. Impurity in CaCl, for instance, just means something that isn't CaCl. Most likely whatever that happens to be is inert (for reef purposes). And, since a reef is a far cry from a flask in a lab, those couple % of non CaCl is meaningless.
Further, if there does happen to be something like Al that sneaks in there, it is in the most negligible quantity and will be removed by something like a resin.
Off the top of my head, I can think of 100 other far more pressing issues/threats to coral health than some random ion that probably isn't in any sort of concentration capable of even hitting the radar.