Why the order matters
- Dilution first, because draining changes every other number.
- Slow or bulky chemicals next: calcium, salt and stabilizer take time to dissolve.
- Alkalinity before pH, because pH dosing depends on alkalinity.
- pH before chlorine, and never the two together: acid and chlorine release chlorine gas if they meet.
- Chlorine last, ideally at dusk.
Untested values
Leave a field blank if you did not test it. The calculator only doses what you measured and never guesses a missing value.