Tests for Free Chlorine, Cyanuric Acid, pH and Total Alkalinity.

- Just dip an AquaChek Yellow strip in your pool or spa water for one second, and remove it immediately. You get test results in seconds!
- To keep your pool at its best, test at least twice a week, and test your spa before each use.
- It's also a good idea to write down your results each time you test, so you can track changes. 50 strips per bottle.

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