CALCULATOR · FREE免费 · Free
Pool Chlorine Calculator
Enter pool gallons, current free chlorine and a target to estimate the ppm increase and pounds of 65 percent granular chlorine. Follow the product label.
--Increase · ppm
--65% granular chlorine · lb
Estimates only; verify on site before ordering or building.
Example
| Item | Value | Unit |
|---|---|---|
| Gallons | 20000 | gal |
| Current free chlorine | 2 | ppm |
| Target free chlorine | 7 | ppm |
| Increase | 5 | ppm |
| 65% granular chlorine | 1.25 | lb |
Where people go wrong
- Using total chlorine instead of free chlorine.
- Ignoring the product's available chlorine and assuming 65 percent.
- Adding it all at once instead of dosing in steps and retesting.
FAQ
What should free chlorine be?
Commonly 1 to 3 ppm; shock levels are higher for a short time. Follow local codes and the label.
Does this replace testing?
No. Test first, dose, then retest; product strengths vary widely.