The Mainstays 3-Way test kit includes testing analysis for chlorine, bromine, and pH of your pool or spa water. This test kit is uniquely designed to be stored neatly and discretely since it comes in a convenient storage container. Each bottle contains 3/4 oz of either OTO or Phenol and comes standard with child-proof caps. You can follow the step-by-step guide or go on the internet for instructions on how to test the quality of your water. This is a perfect tool to easily understand what your pool or spa needs so you can spend more time relaxing instead of worrying.