Thank you again for your bountiful information. After reading several times, I finally "get" the necessity of keeping the pH so finely tuned. Thanks to:

http://richardfalk.home.comcast.net/...ool/OBrien.pdf

This was found reading your site. (It would be so satisfying to have found this on my own!)

The key features are
p 21. HOCl is 80 times more bactericical than Ocl(-)
p 23. The dotted lines for HOCl and Ocl shift with very slight pH shift, due to y-axis being logarithmic.
p 25. HOCl is more stable than OCl in sunlight.

Right now CYA is ~50 ppm and we'll see how it works out. As your site illustrates, it is easy to raise, but lowering is more difficult.

THANKS!