Five checks before anyone gets in
Safety depends on water and hardware, not chlorine alone
- Safety depends on water and hardware, not chlorine alone
- Free chlorine
- pH
- CYA or stabilizer context
- Latest test time
- Do not use smell or color as the final answer. Test and inspect.
- Better to keep people out than to guess.
Confirm bottom visibility, sanitizer, pH, barriers, drain covers, and hazard status before anyone gets in.
- ✕Do not let swimmers in if you have not tested today.
- ✕Do not let swimmers in if you cannot see the bottom clearly.
- ✕Do not ignore a broken drain cover, loose electrical, or a chemical spill.
Free chlorine / pH / CYA or stabilizer context / Latest test time
Confirm bottom visibility
If you cannot see the bottom clearly, keep swimmers out.
Confirm sanitizer and pH are in range for your product
Use a fresh test. Not yesterday result.
- Do not use smell or color as the final answer. Test and inspect.
Check that the barrier and drain covers are intact
Visible hazards overrule good test results.
Do not swim during electrical, storm, contamination, or chemical hazards
Good sanitizer and pH do not override a live hazard.
- Better to keep people out than to guess.
Resources (3)
CDC home pool water treatment and testing
CDC guidance for residential chlorine and pH floor checks, including stabilized chlorine context.
CDC healthy swimming safety guidance
Owner-facing guidance for reducing pool injury and illness risk.
Pool Safely drain-cover safety
CPSC Pool Safely guidance on checking drain covers and closing a pool when a cover is broken or missing.
Educational guidance only. Verify labels, manuals, local code, and site conditions before acting. Stop for electrical, gas, structural, drain, drowning, injury, emergency, or chemical-mixing risk.