For optimal performance the flow cell should be cleaned from once a year to once a month, depending on the type of samples being analysed. Manually pump 50 ml of 0.1 N Hydrochloric Acid into the color module and leave the cell to soak overnight. In the morning, pump 100 ml of deionized water through the module to rinse the cell. This process can be automated to occur after every rack of samples run.