Thanks. Got my kit yesterday. I went ahead and checked my CYA this morning. I have a question. I followed the directions that came w/the kit. I added 7cc pool water and 7cc of reagent and mixed for 30 sec. It says my solution should be cloudy and then to slowly transfer to comparator tube until black dot disappears. My solution wasn't cloudy, so the black dot never disappeared. I assume that is because I haven't added any CYA yet? I'll check everything except CYA tonight to see how much chlorine I have left the sun works its magic on it. I'm going to use the pool calculator to figure how much CYA to add.