Verify labels, manuals, local code, and site conditions before acting.
When strips are good enough and when they are not
Use strips for screening, not for high-stakes decisions
Strips are fine for a quick check. They are not the final word when you are about to drain water, SLAM a pool, or make a large correction.
- ✕Do not rely on strips alone for SLAM, OCLT, or high-chlorine troubleshooting
- ✕Do not dose from a strip result when the bottle has been open in heat or humidity
- ✕Do not trust a strip color match when the next decision is draining, acid washing, or a large chemical dose
FC / pH / TA / CH / CYA
Use strips for fast trend checks
A strip can answer rough yes/no questions fast.
Verify surprise readings with a liquid kit
Some decisions need better resolution than a color pad can provide.
- Retest with a stronger method before draining, acid washing, or adding a major chlorine dose.
- High sanitizer can bleach some strip pads and make the number look lower than it is.
Distrust strips after heat or humidity exposure
Technique problems make a rough method rougher.
- When the strip is ambiguous, record a range and retest with liquid chemistry.
Never base a major dose on one strip result
Keep strips for screening and move to a liquid kit for real decisions.
Resources (6)
CDC residential pool and hot tub treatment guidance
CDC's baseline note on why strips trail a DPD kit.
Digital Readers and Photometers
A better screen than strips, but still not the final call.
Trust the result before you dose
Retest rules and sample-handling checks before dosing.
Run the test in the right order
The liquid kit when strips are too blunt for the decision.
Pool glossary and core terms
Plain-language help for FC, CYA, and the rest.