When adding CYA, slow and patient is the key.

Calcium is pushed by all pool stores (except one salesman in one store I know) for vinyl pools when it is useless. Heaters and SWCGs MAY require a certain level of calcium and it's worth to avoid voiding the warranty. But calcium is a mystery to most pool store guys. The "computer" says add it so they say add it. It's for concrete-type pools, not vinyl ones.

Carl