Tests for Free Chlorine, Cyanuric Acid, pH and Total Alkalinity
50 strips per bottle

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 spa at its best test your spa before each use, or two or three times per week when you are not using it. It's also a good idea to write down your results each time you test, so you can track changes.