Very interesting, very informative, and *definitely* something that I'll need to spend some time thinking about . . . once I have some time.

But, it still all goes into the China Shop*. Richard, please remember (or you may not know) that probably fewer than 10 regular users on the Forum are able to BOTH understand the data you've presented AND work out its practical implications. My guess is that less than 5% of the people who've read your post so far noticed the log scaling you used on some of the data, and less than 1% can comfortably and easily interpret data presented on a log scale.

Because of the complexity of the data, the tendency will be for some to fixate on some data point or other, make an application from it, and then that will become their 'pool Gospel'. This is an outcome I fervently hope to be avoid!. The last thing I want to do is complicate people pool lives, or to create yet another 'must adjust' parameter, like has been the case with TDS.

Even for me -- and as you know, I was already generally familiar with the data behind your graphs, even before you developed your spreadsheet -- it will take some time for me to digest all data so neatly contained in your graphs, and to think through what the useful and helpful implications of that data are.

Beyond that, we all need to think carefully about how this data can be presented so that it's not only accurate, but so that it will usually be interpreted and applied correctly and helpfully by folks who found algebra a trial!

Meanwhile, it needs to rest in the China Shop, where all us 'pool geeks' can digest and apply it. It's something worth doing! The Cl2/HOCl/-OCl chart has done a world of damage, and it would be a huge shame if careless presentation of this data prevented it from helping to correct that damage!

Sincerely,

Ben

* I need to rename the China Shop, or maybe make a parallel section named something like "For Pool Geeks Only", to distinguish arguments from technical discussions.