Pool Chemical Dosing Calculator
Proper chemical balance keeps pool water safe and extends equipment life. This calculator determines the amount of common pool chemicals needed based on your pool volume and current water chemistry readings.
Chemical Dose Calculator
Always add chemicals gradually and retest after 30 minutes of circulation. Never mix chemicals directly. Follow manufacturer safety instructions.
Ideal Pool Chemistry Ranges
| Parameter | Ideal Range | Acceptable Range |
|---|---|---|
| Free Chlorine | 2–4 ppm | 1–5 ppm |
| pH | 7.4–7.6 | 7.2–7.8 |
| Total Alkalinity | 80–120 ppm | 60–180 ppm |
| Cyanuric Acid (CYA) | 30–50 ppm | 30–80 ppm |
| Calcium Hardness | 200–400 ppm | 150–500 ppm |
| Salt (saltwater pool) | 3,000–3,500 ppm | 2,700–3,400 ppm |
Frequently Asked Questions
How often should I test pool water chemistry?
Residential pools should be tested at least 2–3 times per week during swimming season. Commercial pools are typically required by health codes to test at least twice daily and maintain written logs of all readings and chemical additions.
Can I add all chemicals at once?
No. Add one chemical at a time, allow it to circulate for at least 30 minutes, then retest before adding another. Some chemicals can react dangerously when combined — particularly chlorine and acid. Always add chemicals to water, never water to chemicals.
What is the difference between free chlorine and total chlorine?
Free chlorine is the active, sanitizing chlorine available to kill bacteria. Total chlorine includes free chlorine plus combined chlorine (chloramines), which are spent chlorine molecules that cause eye irritation and the “chlorine smell.” The difference between total and free chlorine is your combined chlorine level — ideally below 0.5 ppm.