Our pre-filled dilution vials are designed for the food, dairy, pharmaceutical, water and wastewater industries. Each vial is offered in various fill sizes along with a variety of buffering enrichment solutions. The wide 45-mm opening accommodates large samples. A flip-top lid allows for easy one-handed opening. Bottles also feature clear polypropylene for easy sample viewing. Final pH for all solutions is 7.2 pH ±0.2 pH at 25°C. Butterfield’s Phosphate Buffer is used as a diluent for the preparation of dilutions in plate count and other laboratory processes. It is recommended as a general diluent in laboratory procedures by the Federal Drug administration and in the Bacteriological Analytical Manual. This product is described in the Standard Methods for the Examination of Water and Wastewater for use in water testing. Contains deionized water and monopotassium phosphate. Phosphate Buffer with Magnesium Chloride is used as a diluent for the preparation of dilutions in plate counts in the dairy and food industries. It is recommended by the APHA for the recovery of injured microorganisms from dairy and food samples. Contains deionized water, monopotassium phosphate, and magnesium chloride. Peptone Water is used for the cultivation of non-fastidious organisms such as Salmonella, for performing the indole test, and for studying fermentation patterns. Contains deionized water, monopotassium phosphate, and sodium chloride. These bottles are gamma irradiated.