If you'll go to Bartier's page, you'll see the display of the simple HOCl / -OCl curve, which correlates HOCl concentration to pH. His index is based on this curve. There are all sorts of problems with that.All in all, I don't see any particular benefit from this discussion for most of the newbies coming here . . . so I'm moving this to the China Shop.
- The assumption that sanitation is provided by HOCl, and not -OCl, is not supported by field research. HOCl *is* a stronger sanitizer under SOME conditions than -OCl, but this fact doesn't always correlate with what's observed in actual pool simulations.
- The simple curve he works from does NOT apply to outdoor pools with stabilizer. In those pools, the curve is radically different, and far more complex. One of my users is developing a *very* complex Excel spreadsheet that calculates HOCl, -OCl and other levels, based on CYA, DPD chlorine, pH, temp, & ionic solution strength. The calculation involves iterative simultaneous solution of 15 (I think) equations. My 'best guess' table is based on some *rough* approximations of this information, along with some adjustments based on field experience.
- Bartier generally assumes that some of the simplistic metrics available to the pool industry are literally and absolutely applicable to actual pools, in spite of the wealth of information to the contrary. His pages are useful, if compared to information provided by Biolab or by pool dealers, but still leave much to be desired.
Ben
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