The pool water tester and shock chlorine kit, ready to use allowing you to analyze and apply treatment against microorganisms and algae. Indeed, this kit contains tests to check the content of your chlorine, the pH value, the total alkalinity in your pool or spa water, and a stabilizer. These different elements will allow you to determine the presence or absence of algae and other contaminants. If these elements are present, you can use the chlorine tablets to perform a shock chlorine and thus effectively purify and disinfect your pool or spa water. Advantages: Easy to dose Effective disinfection Protection against algae Characteristics: pH: 6.2 to 8.4 Free chlorine: 0-10 ppm Total alkalinity: 0-240 ppm Stabilizer (cyanuric acid): 0-300 ppm Packaging : One SCP pool water tester and shock chlorine kit - 511249Delivered in its original packaging