All this may be true for your pool. My experience has been that it takes longer for my pool to get up to the reading that I aim for when I add cya. So, although in some pools it may be in there and measureable fairly quickly, for some pools that doesn't always appear to be the case. Therefore, when I answer posts, I will still continue to advise people to wait awhile before testing again (to save reagents) or adding more. Better to be a little patient that overshoot a target of cya since it could mean a partial drain and refill.

Thanks for sharing!