During ballasting, the water goes through the filter, where organisms and sediment (with a diameter larger than 40 microns for ERMA FIRST FIT and 20 microns for ERMA FIRST) are separated and further discharged overboard, to their original habitat. The filtered water is then entering the Electrolytic Cell. From the chlorides of the water, free chlorine is produced through the process of electrolysis at very low concentration (4-6 mg/L for ERMA FIRST FIT and 10mg/L for ERMA FIRST). The treated water then, enters the vessel’s ballast tanks.
During de-ballasting, the system will only monitor the residual oxidants and will further intervene if necessary. The main stages of the system (filtration and disinfection) are bypassed. A chlorine sensor samples the residual chlorine at the discharge line. If this is greater than 0.1 mg/L, then it drives a dosing pump for the dosage of a neutralizing agent (Sodium Bisulfite). The successful neutralization of the free chlorine is confirmed by a second chlorine sensor, installed at the far end point of the ballast discharge line.