Pool chlorine levels chart
What are ideal pool levels?
Ideal pool levels are:
Chlorine: 1–3 ppm
pH: 7.2–7.6
Alkalinity: 80–120 ppm
Calculate Your Levels
Direct answer: Daily maintenance for most pools is about 1–3 ppm free chlorine. Temporary shock or algae treatment can require much higher ppm for a short time—always use testing, circulation, and label directions.
Chlorine targets (table)
| Scenario | Free chlorine (typical) | What it means |
|---|---|---|
| Normal swimming | 1–3 ppm | Sanitize without excess irritation |
| Heavy use / rain | Top of range or brief bump | Demand spikes; retest sooner |
| Standard shock (example) | ~+10 ppm granular raise | One common product curve—verify with calculator |
| Double shock / algae | ~+20 ppm granular raise | Severe cases only; watch swim wait times |
Reading the numbers
Test strips and drops report free chlorine—that is what protects bathers. If algae appears or water turns dull, the problem is often filtration, CYA, or pH as much as “more chlorine.” Pair this chart with a shock calculator when you need a large raise instead of guessing bag counts.
After any shock, plan on retesting every few hours while the pump runs until free chlorine returns to a swim-safe range and clarity improves.
Get exact ounces
Last updated: April 2026