Aqua Article October 2015 by Eric Herman New Thinking: Chlorine/Cyanuric Acid In Bal

Ben,

Please see a portion of the above cited article.

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Falk pointed Lowry to a chapter about the equilibria of isocyanurates. "According to O'Brien, there was more chlorine tied up by CYA than I had previously believed," Lowry recalls. "I subsequently spoke with some of the chemists at Monsanto, which makes cyanuric acid, and also some of the companies that manufacture trichlor. These conversations confirmed the view that there is indeed an equilibrium relationship between chlorine and CYA."

(Lowry also cites chemist Ben Powell for first developing the 7.5 percent concept back in the '70s.)
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Where did the 7.5% come from? Was it experimental or experiencial? If experimental, will you share the data?

Thanks,

Thomas Andrew