AquaChek is the most reliable test strips on the market. AquaChek Yellow tests Chlorine, pH, Alkalinity, and Calcium Hardness and comes in a bottle of 50 test strips.
Simply dip strip in water for 1 second and in 15 seconds you have the accurate color coded reading of Bromine, pH, Alkalinity, and Calcium Hardness. Very important to test your water on the initial fill to be certain of your hardness level since raising Calcium levels is better accomplished in cool water. Test water before each use or at least once a week to be certain your pH and chlorine levels are safe for entering your spa water.
WARNING: Test Strips are one of the few spa chemical products that have shelf life so be sure to read the expiration date on the label. Remember 1 dog is equivalent to 500 bathers in a 400 gallon spa and two bathers in a 400 gallon spa is equivalent to 150 swimmers in a 20,000 gallon pool.