Way back in 1984 I founded my service and repair company, The Pool Surgeon. I had no idea what ORP and LSI abbreviations meant, let alone their definitions. To be completely honest with you, I am not certain I was any better informed in the first 25 years of my pool career. As ashamed as I am to admit it, I'm admitting it because it's the truth.
Calcium hardness has a bad reputation, and that reputation is undeserved. When people see calcium scale or plaster problems that are white in color, they immediately assume it's calcium's fault. In reality, calcium is actually your best friend for water balance, as it is remarkably stable, and able to help you keep your pool in LSI balance year-round.