Oxalic acid has been used for decades against mites. It has its pros and cons like everything. It may be modified or mixed with other things, as in this case. But I doubt that affects its usefulness very much if at all. 

SUMMARY
Denomination of the test item: Bee-Vital-Hive Clean mite control product
Active ingredient: oxalic acid

"An efficacy study of the BEE-VITAL HIVE CLEAN mite control product in commercial apiaries" (2005)
www.beevital.com/uploads/file/Final%20Report%20Godollo.pdf

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