I had my pool company come by today for a 1 hour demo of my pool equipment for a 30,000 gallon in ground pool with salt chlorinator. During the process he advised me not to add calcium as that will be somehow problematic. I don't recall specifics unfortunately. So I returned the 25 lb bag of calcium to the pool store where I was lambasted for following such ill-advised information. Now I have contradictory information, and I'm here hoping someone will be able to shed some light on this issue.