Best for
- Liquid-chlorine users
- Owners correcting a known free-chlorine deficit
- People trying to avoid over-dosing
Watch for
- CYA changes the appropriate free-chlorine target
- Product concentration varies
- Testing errors can be larger than the calculated dose difference
Volume error creates dosing error
If your pool is actually 18,000 gallons and you dose it as 25,000 gallons, every calculated addition is oversized. Start with the best volume estimate you can make from dimensions.
Dose to a target increase
The useful question is how many ppm of free chlorine you want to add. The required product amount then depends on pool gallons and the percentage strength of the chlorine product.
Chemistry context still matters
A calculator can estimate dose quantity, but it cannot determine the correct sanitation target without your stabilizer level, current test results and local operating conditions. Retest after dosing and circulation.
Pool-equipment claims are often based on different pool sizes, operating modes or test conditions. Compare the same job, pool dimensions and ownership assumptions before choosing a product.