Hi Carter;
Dunno if your pool company is ignorant, or just trying to keep from scaring you.
Ok, here goes:
+ "Turns yellow" reagent = OTO, orthotolidine. Your guy can NOT accurately estimate levels using that. Trust your Taylor -- but check the instructions and make sure you are following them.
+ With CYA = 100, 16 - 20 ppm FC should be fine. See Best Guess chart (no longer a guess!) linked in my sig.
+ Out of curiosity, who's your company? Sounds like PoolChlor or one of the other long-time chlorine "shooter" companies. If so, you may have a new guy who doesn't understand everything he's been taught.
Ben
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