Hi!

Good news: You never have to worry about calcium again as long as it's below 400ppm. Calcium does nothing for vinyl pools. only concrete ones. I test calcium once or twice a summer.

We don't tend to use phrases like "normal range" because there is too much variance depending on the pool, and too many different definitions of "normal".

We need to know two (or 3) numbers: 1) your stabilizer (CYA) level 2) your Free Chlorine and either TC (total chlorine) or CC (combined chloramines) because TC = FC + CC.

Carl