The ALERT System is a new sensor for real-time bacterial measurements, manufactured by the company Fluidion. The device is fully autonomous, remotely controllable, installed in-situ and allows rapid quantification of E.coli or enterococci concentrations. Suitable for monitoring water and the environment, it performs seven measurements on a battery charge. Installed in-situ, it allows rapid quantification of bacterial concentration and emits real-time automatic alerts.


Ensuring microbial safety is one of the key objectives of bathing water management, and it is also a critical aspect for water reuse. The European Bathing Water Directive (BWD) (76/160/EEC, 2006) uses fecal bacteria quality assessment of marine and inland waters. A major challenge regarding urban bathing water management is to ensure the safety the users and comply with regulations. Concentrations of fecal bacteria may show spatial and temporal variability. In urban rivers, discharges from CSO and stormwater may contain high amounts of fecal bacteria and contaminate the bathing water.

Limitations of current practices

Bathing water surveillance in Europe is usually based on monthly grab samples analyzed in approved labs and event-scale variability is detected only by chance, as pollution events may occur between sampling intervals. Even for major monitoring campaigns, grab sampling does not allow to track the pollution variability since events might happen at night or during weekends. .Another drawback of grab sampling and lab analysis is the potential sample degradation and long time-to-result with existing lab technologies. Sample is collected, then transported in refrigerated condition prior to be analyzed in the laboratory, a period of time where the sample degradation can occur. Besides the logistic complexity and risks associated with manual sampling, the results of water quality cannot be obtained instantaneously and are generally available after minimum 2 days due to the duration of the procedure sampling-transport-analysis and reporting.

Online monitoring solutions already exist but are not accepted by health authorities. Competing technologies do not have the capability to monitor in an automated fashion directly in situ, without any infrastructure needs. The competing fast measurement techniques are unable to quantify cultivable bacteria, but count all bacteria (or their enzymes) including those that have been deactivated by UV or other disinfection treatments – therefore the application of competing solutions for wastewater effluent or reuse water monitoring is severely limited. Most competing solutions do not have the specificity required and have significantly higher CAPEX and OPEX costs.


The ALERT System  has the following major competitive advantages:

ALERT System is the only product that makes fully automated active monitoring possible, by analyzing sequences of samples in situ, accurately, affordably and without need for human intervention.

City tests

The ALERT System is currently tested in Berlin and Paris using side by side laboratory comparison to understand temporal variability and spatial bacterial distribution in the local rivers (Seine, Marne and Spree). In Milan, the system is being deployed to provide early warning of bacterial and toxic contamination linked to water reuse at a major wastewater treatment plant.

Contact solution

FLUIDION, Dan Angelescu :
FLUIDION, Vaizanne Huynh :
FLUIDION, Andreas Hausot :

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