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FROG Test Strips - 50 Count (01-14-3318) are specially formulated for precise reading of low chlorine or bromine levels plus pH and total alkalinity. For use with Frog Mineral Systems that reduce chlorine or bromine use up to 50%. Pool Frog requires at least 0.5 ppm of chlorine while Spa Frog requires at least 1.0 ppm bromine. Easy-to-use FROG Test Strips are specially designed to test your spa water for precise low chlorine or bromine levels along with pH, total alkalinity and hardness levels.