These strips test your spa water’s total hardness, total chlorine or total bromine, free chlorine, pH, and total alkalinity water parameter to help you keep your spa balanced. Test manually with the level indicators shown on the spa test strip bottle. Test regularly to maintain a pH balance of 7.2-7.6 and 3-6 ppm of bromine, or 3-5 ppm free chlorine. Drain, clean, and refill your spa every 90 days.