Ok, I'm an idiot. He added some trichlor pucks in the chlorine feeder - so I guess that's what they meant about adding cyanuric acid. I didn't test CYA last time.
In other news, I went out today and saw air coming out of a return jet. The pump lost prime and it was super hot and steaming!!!
I let it cool off and cleaned out the basket, checked for any obstructions, primed it and started again. After it blew all of the air out it was working great again. Then I'm walking back to the house and notice the basket I forgot to put back in... I'm moving up from idiot to whatever the next level is.