I'll alert Richard to your question; I've been wanting a better documented version of that spreadsheet, myself. I'd like to have it audited, but I don't have the skills to do so myself, and those I know who do, and might be willing to do so, will need clear documentation. If you can persuade him on that point, I'd be grateful.
However you may be barking up the wrong tree on the app -- because an iPhone app based on his spreadsheet already exists (see poolcalculator.com ).
I'm not too interested in having PoolForum support a new version of such an app, because the versions that already exist inadvertently encourage people to chase numbers, rather than enjoy their pool. We fielded quite a few questions and problems here, last summer, that resulted from people following the PoolCalculator right into NeverNever land. I want a much simpler app, not a new and more exact one!
Of course, there's also a good chance Jason Lion at TroubleFreePool.com probably won't be too interested, because it's his app!
Outside of my site and TFP, the direct correlation of chlorine and CYA with respect to chlorine's efficacy is still considered premature at best, and pool voodoo at worst. But, it's that concept that lies at the heart of Richard's spread sheet.
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