Chlorine smells, stings and needs testing. Can you skip it?
The short answer: not if you follow the CDC. Its guidance for home pools is built on a minimum free chlorine level (1 ppm, or 2 ppm with stabilizer) and pH, and it says the best way to kill germs is to maintain free chlorine and pH. The CDC mentions UV and ozone for breaking down chloramines; we found no CDC statement that they replace chlorine. Mineral systems such as FROG say they work alongside chlorine.
Part of: Pool Chlorine: Types, Levels and How to Keep Them Steady, our overview of every chlorine question.
What the CDC says
- "The best way to kill germs is by properly maintaining the free chlorine concentration and pH."
- Minimums: at least 1 ppm free chlorine in pools, 2 ppm with stabilizer, 3 ppm in hot tubs.
- UV light or ozone systems can break down chloramines and are known to kill Cryptosporidium (CDC, for pool operators). We found no CDC statement that they replace chlorine.
The usual "chlorine-free" options
| Option | What the sources say |
|---|---|
| Salt water chlorine generator | Not chlorine-free: it makes chlorine from salt. TroubleFreePool counts it among the two best chlorine options. |
| Mineral system (FROG) | FROG: its minerals "work alongside chlorine", at 0.5 to 1.0 ppm. See pool mineral systems. |
| UV or ozone | CDC: break down chloramines; no statement that they replace chlorine. |
| Bromine | Another sanitizer the CDC names next to chlorine for killing germs; not covered further here. |
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Test kit A test kit that reads free and total chlorineFree chlorine and total chlorine are two separate readings. The CDC calls a DPD test kit the most accurate option for home pools; test strips are less accurate. Follow the kit's own instructions.
FAQ
Is a saltwater pool chlorine-free?
No. A salt system turns salt into chlorine in the cell; the water still contains chlorine (TroubleFreePool lists salt generators as a chlorine source).
Sources
- CDC: Home pool and hot tub water treatment and testing (free chlorine and pH, minimums)
- CDC: Chloramines and pool operation (written for pool operators) (UV and ozone break down chloramines)
- CDC: Guidelines for keeping your pool safe and healthy (chlorine or bromine kill germs)
- FROG: Fresh mineral water (minerals work alongside chlorine, 0.5 to 1.0 ppm)
- TroubleFreePool: How to chlorinate your pool (salt generator as a chlorine source)
Sources read on November 4, 2026. Product labels change: the label on the product you buy always wins.
