King Technology Frog Pool and Spa Test Strips Pool Frog requires at least 0.5 ppm of chlorine while Spa Frog requires at least 1.0 ppm bromine Frog Pool and Spa test strips are also great for any application in which accurate low range bromine or chlorine test results are needed Experience the mineral benefits of using up to 50-Percent less chlorine or bromine with Pool Frog and Spa Frog test strips