Ben:

Very willing to learn based on updated info!!!

1/ "Wojitowisc' journal article in the JPSI" seems to be what I found at jspsi.poolhelp.com/ARTICLES/JSPSI_V5N1_pp20-38.pdf and the table on chlorine is indeed informative though not very legible. Your best guess chart reads much easier ;-) Any pointer to "Obrien (1972, I think) and Wojitowisc (circa 2000) and his own extensive analysis published here" (I could not find this)?

2/ Do you or Chem_Geek have a page summarizing updated recommendations kind of like what is on that page 44 of the Taylor guide but updated?

Thank you!