It probably is with the disclaimer that, as of 2006, Dow was using a different (read less expensive) purification process and no longer recommend their products for pools because of the higher bromine concentration. They also sold off their calcium chloride division and its brands in 2009 to Oxy. However, the amount of bromine added is small (smaller than if you had added a sodium bromide based algaecide) and is quickly destroyed by sunlight and shocking.
http://www.oxy.com/Our_Businesses/ch...plications.pdf
Tetra calcium chloride products, on the other hand, are still recommended for pool use (and is what I have seen and purchased in 50 lb bags the past few years).
http://www.tetrachemicals.com/Produc...ETRA_Flake.aqf
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