That's very helpful, thanks!
If that's 6-9 ppm of the volume of the tablet then, if my math is correct (approx 4,5 cubic inches per tablet, 51 tabs/gallon, 18000 gallon pool), it's going to take me 924000 tablets to raise my CYA 9ppm. At 3 tabs a week that's around only 5000 years. I better...