BRS chemicals are pharmacetical grade that they purchase in bulk and spend little to no money on fancy packaging or advertising so they can offer the good stuff in large quantities than companies like Kent/SeaChem/Marineland, etc. Most of the other companies use food grade or "industrial grade".
Remember that food grade and industrial grade doesnt necessarily mean its purer - the differenent grades allow for different levels of certains elements to exist within the product. I would think the pharm. grade stuff has fewer "toxic" or "reactive" elements for its probably being used in conjuction with other items to create medication and what not.
I'm sure Caco's stuff will be just as good as lBRS's as long as its certified as pharmacetical grade.
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