Multiple threads on this topic...
It appears that southdown was bought out and the new product is by Kolorscape, the blue bag. It also appears that over the last several years they have been phasing out the use of aragonite based sand and switching to a silica based sand. The blue bags from all the home depots in my area do not pass the vinegar test.
You may also consider that $50 or so for 60 lb of aragamax isn't really that much to spend compared to the overall aquarium costs and you'll certainly have no worries that way.
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