The pucks I have are 99% trichlor. The label also states 90% available chlorine, and there is no mention of copper.

There is a lot of info on here regarding chlorine and most of the other chemicals, but I'm having trouble finding posts and articles that discuss CYA. I would be most appreciative if you could point me to a few. I really have read a lot and looked pretty hard, but I probably just missed them. Specifically, I am trying to determine how much impact each of these pucks will have on the CYA level and the pH of my pool.

My FC dropped 2ppm overnight, so better than Sunday night but not quite fully done fighting algae. Yesterday was the warmest day of the year so far in Houston - it touched 90 - so chlorine level was all the way down to 4.5 by the time I got home from work around 7 PM. Since I am gone for so long during the day, and because my CYA is low, I went ahead and put my floater in the water this morning along with the morning addition of bleach needed to push FC back up to 12. So I would like to calculate what impact this will have. I will also test my pH tonight and begin moving it back up to the 7.4-7.5 range.