The inovative BactoSense is a fully automated Flow Cytometer specifically designed for the requirements of the drinking water industry for microbiological monitoring of drinking water. The whole program sequence, sampling – adding of reagents – mixing – incubation – measurement – cleaning is performed fast and fully automatically. The whole program sequence only takes 30 minutes. All manual preparation steps are eliminated therefore no specially trained staffs are required. The compact BactoSense with a low foot print, detects more than 99-% of bacteria. All chemicals, including waste, are packed in a hermetically closed, recyclable cartridge. The cartridge is sufficient for 1000 measurements. The exchange of the cartridge is as easy as the replacement of an ink cartridge in a printer. An automatic and a manual mode allow simple and clear operation. An internal data-base allows recalling and displaying measured data from previous years.