You need to keep a minimum of 5 ppm chlorine in a pool with CYA of 80, otherwise you're going to be fighting algae all summer. Also, if you use the trichlor pucks again this year, it's going to continue to increase your CYA and lower your pH, so I strongly suggest you use cal-hypo or bleach this year. I purposely run my pool at a CYA of 80 because I have all-day Louisiana sun with no shade and constant high humidity, but even I wouldn't allow my pool to go higher than 90 because I'd rather spend the summer swimming in my pool than shocking it.

Janet