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Leisure Time 45010 Chlorine Test Strips, 50 Count. Fast, easy and accurate spa water testing with the dip of a strip. Simply dip a strip in the spa or hot tub water, and compare to the color chart on the back of the bottle. Easy-to-read spa test strips and hot tub test strips test spa water for: pH, total alkalinity, calcium hardness and chlorine. Compatible with chlorine and ozone sanitizers. Leisure Time 45010 Chlorine Test Strips, 50 Count