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3M™ Petriﬁlm™ Aqua Coliform Count Plates are sample-ready media plates used to measure coliform levels and provide reliable test method for bottled water. Each plate contains a water-soluble gelling agent, nutrients and indicators in a dry, shelf-stable format. The indicator dye colors all colonies red, and the top film traps the gas produced by the coliforms. Gas trapped around red coliform colonies indicates confirmed colonies.