Easychem COLI online is an analyzer for Presence Absence (P/A) detection of coliforms in water and to quantify their contamination by automated Most Probable Number (MPN) statistical technique. EASYCHEM COLI online simultaneously detects both Total Coliforms (TC) and Escherichia coli (EC) or Faecal Coliforms (FC) in water and wastewater. MPN results are provided in 15-18 hours, according to the measurement range. The online analyzer allows to recognize coliform contamination by performing P/A tests (TC and EC or FC) that can be combined with MPN statistical quantification at 35-37 °C (TC and EC) or 44.5 °C (FC), with an analytical frequency adjustable to customer’s needs. At the same time, the Time To Detect (TTD) technique allows early warning estimation of TC and / or FC concentration. MPN measurement frequency can be programmed up to 12 measurements / day and the online analyzer allows a long term unattended autonomy, due to the direct reading analytical technology including cuvettes automated washing and sterilization.