Tests for Free Chlorine, Cyanuric Acid, pH and Total Alkalinity - 50 strips per bottle
Just dip an AquaChek Yellow strip in your spa water for one second, and remove it immediately. You get test results in seconds! To keep your spa at its best, test at each end 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.