Why both readings are on one row
Chlorine and pH belong together in the same log line because the reading makes more sense when you can see the pair at once. That is why Poolsheet keeps them side by side in the pool log sheet, with room for a clean record and a quick review on the same visit. You can also start at the guides page or return to the home page.
Where the windows come from
The windows come from the CDC model code note that belongs with this topic, not from this page. Poolsheet uses that note to shape the features that support a pool chlorine ph log, while leaving the actual target windows in the source note that your team already uses.
What a high or low reading means for the log
If a reading falls outside the window, write that reading exactly as seen and add the follow up note your site uses for review. Do not guess at a target on this page, and do not treat the log as a replacement for the full field procedure. If your team tracks the app waitlist, the get the app page is where that starts.
No dose on this page
This page does not give a chemical amount, because the right step depends on the label, the site plan, and the local code note. If you need the amount, use the product label and your own operating procedure, then record the result in the log rather than trying to infer it here.
Chlorine and pH windows in the model code
- pH of the water: 7.0 to 7.8 (section 5.7.3.4.1).
- Minimum DPD free chlorine when the venue is not using cyanuric acid: 1.0 ppm (section 5.7.3.1.1.2.1).
- Minimum DPD free chlorine when the venue is using cyanuric acid: 2.0 ppm (section 5.7.3.1.1.2.2).
- Spas: minimum DPD free chlorine 3.0 ppm (section 5.7.3.1.1.2.3).
- Maximum free chlorine: do not exceed the product label (section 5.7.3.1.1.5). This page does not print a numeric chlorine ceiling.
- Cyanuric acid at aquatic venues stays at or below 90 ppm (section 5.7.3.1.3.2). If cyanuric acid is 300 ppm or higher, the venue stays closed until remediation (section 5.7.3.1.3.3).
Sources: 2024 CDC Model Aquatic Health Code, 5th edition (PDF) and CDC notes on operating public pools. Poolsheet is not part of the CDC.
Follow your local health department code. Poolsheet is not a health authority, not a pool operator license, and nothing here means the water is safe. The CDC Model Aquatic Health Code is voluntary guidance, not your local rule.