Mike, Hi

I found this thread which covers adding cya. I suppose I could have linked another post with my 'method' of ascertaining how much cya to add - but it's probably easier for me to just say the when I add cya to a SWCG pool I tie it to the salt - 1 lb cya/ 100 lbs salt gets you to 30 - 40 ppm , if you're shooting for 60 - 80 ppm cya, add 1 lb/ 50 lbs salt. If you know how much salt you originally added to the pool to put you in the 2800 - 3200 range, you'll know ~ how much cya to add to get it where you want it to be. (& you'll also know how much to add when you need to raise the salt)