Tests for Free Chlorine, Cyanuric Acid, pH and Total Alkalinity
Just dip an AquaChek Yellow teststrip 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 each end a minimum of twice a week, and test your spa before each use. Its also a good idea to write down your results each time you test.
Comes with complete instructions. 50 teststrips per bottle.