Aqua Chek 4 in 1 Test Strips

AquaChek Yellow / Chlorine Test Strips test for Free Chlorine, Cyanuric Acid, pH and Total Alkalinity

Just dip an AquaChek Yellow / Chlorine 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 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.