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Heyo, I'm a long time TFP lurker! I've drunk the Kool-aid, bought the test kid and preached the TFP gospel to all the pool owners I meet. But, alas, the dreaded Black Algae set in last year. Our plaster pool (15Kgal, pic attached) is LOOONG overdue for a redo; it's pitted and pocked and...

For practical purposes I use (and love) the testing supplies in my TF-100 kit. They are certainly accurate enough for general pool-maintenance. BUT, this question is more of a technical curiosity nature. How would a lab or scientist test the CYA of water if they needed to figure it out to a...