Ballast Water Treatment System

Since the introduction of steel-hulled vessels around 120 years ago, water has been used as ballast to stabilize vessels at sea. Ballast water is pumped in to maintain safe operating conditions throughout a voyage. This practice reduces stress on the hull, provides transverse stability, improves propulsion and manoeuvrability, and compensates for weight changes in various cargo load levels and due to fuel and water consumption.​

While ballast water is essential for safe and efficient modern shipping operations, it may pose serious ecological, economic and health problems due to the multitude of marine species carried in ships’ ballast water. These include bacteria, microbes, small invertebrates, eggs, cysts and larvae of various species. The transferred species may survive to establish a reproductive population in the host environment, becoming invasive, out-competing native species and multiplying into pest proportions.

ERMA FIRST produces the sound and reliable ErMAFIRST BWMS, by being at the forefront of R&D with a team of specialists in Water Treatment Technology, which incorporates the most reliable and efficient filtration followed by a state of the art disinfection stage. Filtration takes place in either 40 microns automatic backwashing filters (ERMA FIRST FIT) or in-house engineered 20 microns hydro cyclones (ERMA FIRST). The disinfection stage takes place in our own-design, highly customized electrodes, providing the appropriate amount of disinfectant agent by using minimum power and ensuring compliance. A special coating is applied on the electrodes, which are designed to minimize the production of harmful byproducts and have an extended life time of minimum 5000-6000hrs of operation.




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.


Simple & Flexible, Zero Maintenance, Horizontal or Vertical Installation, Low energy consumption, Negligible pressure loss, No corrosion risk, No acidic cleaning (CIP) is required, Explosion proof type available,  Capacity range 50 to 3000 m3/hr, Made in Sweden.


  • Simple and Flexible

  • Suitable for all pump capacities

  • Suitable for Fresh Water (0,9 PSU Salinity) and Low Temp. Waters (3oC)

  • Low Power Consumption in Various Waters (1,8 kW/100m3 at 30 PSU)

  • Zero Maintenance

  • Extreme sediment removal

  • Very Low Associated Fuel and Operating Costs


  • IMO Type Approval by Lloyds/Greek Maritime Administration and Liberia Maritime Administration

  • USCG AMS Acceptance

  • CCS & ABS class type approval in progress

  • ATEX vs IECEx ERMA FIRST BWT Systems are in full compliance withthe IECEx requirements in order to be installed in hazardous locations of U.S. flag vessels

  • USCG Type Approval

MR Tanker

MR Tanker


USCG Approval Certificate
RMRS Approval Certificate
LR Approval Certificate


MR Tanker