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S2Media™ 2x A-1 Medium

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S2Media™ 2x A-1 Medium is a (double-strength) selective broth used for isolation and presumptive identification of fecal coliforms in water. Andrews and Presnell developed A-1 Medium in 1972 to recover Escherichia coli from estuarine water in 24 hours instead of 72 hours, and in greater numbers without pre-enrichment. A-1 Medium can be used in a single step procedure for the detection of fecal coliforms in source water, seawater, treated wastewater, and foods.


Also known as:

  • A1 Broth

  • A-1 Medium Broth


👉 Finished product meets the following standards and references:

  • EPA,

  • SM-WW,

  • USP-NF


🧫 Application Areas:

  • Water quality testing for the detection and enumeration of fecal coliforms by membrane filtration

  • Wastewater monitoring and regulatory compliance testing

  • Environmental water quality monitoring and public health surveillance


Equivalent or Comparable Item Numbers:

  • 2560915

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