Easychem TOX Early Warning is an on-line analyser for drinking water and environmental monitoring applications using dried bioluminescent bacteria, automatically rehydrated to ensure long term unattended operation down to 5 minutes frequency. UNi EN ISO 11348-3 and GB-T 15441 compliant operations minimize false alarms by hydraulics perfect cleaning, running measurement in duplicate and with positive controls. Alarms are available on Ethernet and by FTP to a remote server. Main barriers to extensively use acute toxicity early warning water analysers are the complexity to breed and manage living organisms in an automated device, minimizing false alarms and ensuring long term unattended operation. The use of up to 20 industrially prepared dried bacteria vials automatically regenerated and handled by the Easychem TOX Early Warning analyser coupled with the design based on discrete analytical technology overlaps the above limitations, allowing a very fast detection time in case of heavy water pollution, easy and reliable operations on field by water plants technicians and a low maintenance cost.