Insta-Test 3 is a convenient and simple water test system, testing free chlorine (or bromine), pH and total alkalinity. 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 3 allows you to maintain proper free chlorine levels and balanced water this season.