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Safe Home DIY bacteria test (Single pack) do it yourself testing for: bacteria in water (total coliform & E. Coli) contains one water quality Test vial, which allows you to test for the presence or absence of harmful bacteria in drinking water. fill the vial with a water sample, cap The vial and shake, set on a flat surface and see test results in as quickly as *24 hours (*Speed of results may vary). safe and easy to use plus our bacteria test kit has the optimum technology for faster and more reliable results. yellow = Absence of harmful bacteria. steam = presence of harmful bacteria. *over 3-million water tests sold – worldwide. When you buy from Safe Home, You are purchasing the very best value in accuracy and dependability for your family drinking water safety.