These strips are heavily discounted because they have a short use-by date: September 2019.
They give simultaneous readings for free chlorine, pH, total alkalinity and stabiliser (cyanuric acid).
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.
50 test strips