CYA in a sock

[polyvue]

If you have not used this method you might want to give it a try. It works.
http://www.poolhelp.com/ChemicallyDe...oolVolumes.pdf

Here is the link for the "“Simplified Formula Numbers” chart
http://www.poolhelp.com/SimplifiedFormulaNumbers.pdf
[...]

Yes. This is the source for the formula I used in the spring when estimating volume via Total Alkalinity. Even this technique has its drawbacks but it requires absolutely no vector calculus, an advantage for those of us whose mathematical aptitude and/or enthusiasm declined sometime before or during Calc I.

I mean, how can you compare the "Sock" vs "Skimmer" method unless you can get hard info on how different socks perform?

You're correct; no attempt at a comparison was made. Nor could I figure out how to introduce a meaningful control (having run out of duplicate in-ground free-form swimming pools that were designed and built to my specification); and, besides another test in the same pool, how does one evaluate the repeatability of this experiment?

As Evan pointed out earlier (and AnnaK, above), too many variables. Perhaps my hand was shaking when I titrated (perhaps my hand always shakes but I'm unaware).