200 x Happy Chlorine Test Strips Hot Tub Spa Hottub Swimming Pool Testing Dip
How often should i test my hot tub ?. 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. For PH it is between 7.2-7.6.