They said it was "similar" to an antibiotic. Cyano is a bacteria so I wouldn't be surprised if it was a common antibiotic that you could buy at any feed store. That wouldn't jive with it being an oxidizer though. If it were an antibiotic it would indiscrimately kill the good bacteria in the LR and LS as well as cyano. That's what has got me confused. You rarely find a "golden bullet" when it comes to biocides.

Gary