AquaChek Test Strips are the fastest and easiest way to test your spa or hot tub. You should test at least two times per week and after each use. Tests for total chlorine, total bromine, free chlorine, total alkalinity, pH and total hardness. Includes 50 test strips. AquaChek Spa 6-in-1 Test Strips are the fast and accurate way to check your hot tub for bromine or chlorine, and water balance.