The CLARIS Flow Sensor has been developed specifically to monitor the usage rate of the CLARIS water filter system and to determine the optimum cartridge replacement interval. After setting the programming unit to monitor the specific filter size, the ClaThe CLARIS Flow Sensor has been developed specifically to monitor the usage rate of the CLARIS water filter system and to determine the optimum cartridge replacement interval. After setting the programming unit to monitor the specific filter size, the Claris Flow Sensor continually measures the filtrate volume to calculate and display the remaining filtration capacity in litres. Once the available filtration capacity is exhausted or the maximum operation time has been reached the display unit indicates the filter cartridge replacement. The programming and display unit provides the following information: --Residual capacity of installed filter cartridge --Filtrate volume of the last five installed filter cartridges --Operation time of the last five installed filter cartridges --Total filtrate volume since Flow Sensor installation