Happy Hot Tubs 3 Way Chlorine Test Strips Spa Tub Spas PH Alkalinity Tester Dip
Test for Free Chlorine Level, Total Alkalinity and PH level. How do i know the optimal water levels for my spa?. For Free Chlorine, it is between 3-5 parts per million (PPM) for a hot tub and 1-3ppm for a swimming pool.