Just dip an AquaChek Yellow strip in your hot tub water for one second, and remove it immediately. You get test results in seconds! To keep your hot tub at its best, test before each use. It's also a good idea to write down your results each time you test, so you can track changes.

• Tests for Free Chlorine

• Test Cyanuric Acid

• Test pH

• Test Total Alkalinity

• 50 strips per bottle