Plates are sample-ready, eliminating all the time-consuming steps of preparing media/agar dishes. Detects coliforms in bottled water. This plate has been awarded AOAC® Performance Tested Methods℠ (PTM) Certificate #091101 for bottled water. 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.In today’s environment of heightened focus on food safety and increasingly stringent quality requirements, labs are under pressure to provide tests that are fast, reliable and consistently accurate. 3M Petrifilm Plates have demonstrated consistent performance that has been cited globally with more than 200 certificates, recognitions, validations, and peer-review publications. For more than 30 years, food safety professionals around the world have put their trust in 3M Petrifilm Plates. That’s because 3M Petrifilm Plates have streamlined, standardized and simplified the process of microbial quantitative indicator testing, improving productivity and helping ensure the highest levels of product quality.