Baba Rambler and UnderWaterVaya,
I found the Pool Calculator, thanks!
But the Effects of Adding Chemicals have a choice for Trichlor. Is that the same as almost the same as pucks, assuming most of the weight of the pucks is Trichlor and not the other constituents, like CYA (cyanuric acid)?
It must be, b/c the calculator gives you the 4 different effects (chlorine, CYA, pH, Salt) from the "Trichlor" choice.
;-)