Download ERMA FIRST BWTS Brochure


ERMA FIRST BTWS FIT 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. 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 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). 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.


ERMA FIRST BWTS FIT is an advanced modular system that was developed to exceed all the special installation requirements either for New Building vessels or especially any retrofit project. Covering an extensive capacity range from 50 to 3000m3/hr and holding USCG Type Approval, ERMA FIRST FIT is an ideal solution for all types of ships. The major components of the system are a high-end backwash filter and an electrolytic cell with outstanding performance under the most demanding conditions. The self-cleaning automatic screen filter has a nominal filtration rate of 40 microns. Its special designed screen provides with enormous zooplankton, phytoplankton and sediment removal, minimum pressure and uninterrupted, long-lasting operation at an extremely small footprint element. For the de-ballasting of the vessel there is no need to use the system; It is completely by-passed and the water can be discharged directly overboard, after neutralization where applicable, with considerable gains in energy saving for the operators/managers of the vessel. Using an active substance that is produced by the method of electrolysis, any danger for re-growth of microorganisms is eliminated

Your System



Option 1 / Filtersafe: 40 microns self-cleaning automatic screen filter


Option 2 / Filtrex: 40 microns self-cleaning automatic screen filter


Advanced Technology Electrolysis Cell


ERMA FIRST manages to put you at the heart of the action with the help of the Virtual Reality technology by coming into contact with the actual installation of the ERMA FIRST BWTS FIT 1500 m3/h on board a ship.

Based on 81,000 DWT Bulk Carrier and its operation, two ERMA FIRST BWTS FIT 1500 m3/h are selected and installed on the discharge side of the ballast pumps. Through a virtual work around the engine room, you are able to have an inside look at how the system and its components are placed using the existing pipes, whilst maintaining an exceptionally low footprint.

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