Insta-Test 5 is a convenient and simple water test system, testing free chlorine (or bromine), total chlorine, pH, alkalinity and total hardness. No waiting period necessary, just swirl three times and read. The Pop Top vials have a molded desiccant liner, that protects the strips from moisture, and are easy to open and shut (guaranteed for 1000+ openings). Insta-Test 5 allows you to maintain proper free chlorine levels and balanced water this season.