Evoqua / CHLOROPAC® - MGPS / MGPS & ICCP systems


part no.

SB500 - SB1K - SB2K - SB3K - SB4K - SB5K - SB6K

product options

Typical Chloropac® System Shipboard Installation

The MGPS Mk2M Chloropac® sodium hypochlorite generating system prevents marine growth in seawater piping, heat exchangers, sea chests, and coolers. Ship owners and operators prefer the MGPS Mk2M system, with thousands of installations worldwide. Continuous low-level hypochlorination proves more effective than other marine growth prevention methods. Chloropac MGPS has earned trust in the marine market for over 40 years.


The MGPS Mk2M Process 

A small amount of seawater, 5.7m³/hr (25 GPM), constantly pressurized, passes at high velocity through MGPS Mk2M electrolytic cells, converting part of the salt to sodium hypochlorite. This solution returns to the sea chest, mixing with incoming seawater. The cooling water now contains a trace residual sufficient to prevent marine organism growth, keeping all circuits—from intake to discharge—free from fouling. The system can interconnect with seawater circulating pumps to automatically adjust sodium hypochlorite output to suit on-board flow rates.


Comparison MGPS Mk2M to Other Methods


Effective Dosage

The Chloropac electrochlorination system effectively controls both micro and macro fouling organisms by low continuous dose of 0.5 ppm or less. Additionally, it ensures efficient marine growth prevention
  • Micro: Slime, algae, and weed.
  • Macro: Barnacles, mussels, clams, hydroids, etc.
In contrast, copper ion-type systems claim a dose rate of 1 ppb suffices for all marine growth. However, a dose rate of ~20 ppb is actually needed to control macro fouling. Additionally, continuous dissolution of copper and aluminum does not effectively combat micro fouling.

Cell Longevity and Maintenance Costs

The Chloropac system uses platinum-on-titanium electrolytic cells (anodes) to produce sodium hypochlorite from seawater. These cells are warranted for five years, but typically last around seven years. Conversely, copper-based systems use “sacrificial anodes” that dissolve quickly, requiring replacement every 12-24 months at a high cost. Therefore, ongoing consumable and maintenance costs are lower with the Chloropac system.

Control and Environmental Impact

Chloropac system controllers can be adjusted manually or automatically to regulate hypochlorite production based on demand, allowing for zero or near-zero residual overboard discharge. On the other hand, copper anodes dissolve continuously, discharging copper overboard and adding heavy metal pollutants to the ocean.

Chemical Handling and Safety

The Chloropac system produces sodium hypochlorite using only ambient seawater, eliminating the need to store biocides or precursor chemicals on board. All produced sodium hypochlorite is directly injected into the sea chests, simplifying purchasing, storage, handling, and chemical logistics. In contrast, chemical injection systems require the storage and handling of highly corrosive and toxic chemicals, creating additional storage and safety hazards on board.


In conclusion, the Chloropac system not only provides superior control but also offers lower maintenance costs and reduced environmental impact. Furthermore, it simplifies chemical handling compared to alternative methods of marine growth prevention. If you have any further questions about the Chloropac system or require spares, do not hesitate to contact us.



Evoqua PN




W3T344631 4-10176 12997 Cell Assembly MK2M
W2T624713 5/0849 10118 Spacer pips
W3T290804 5/1000 11525 Cell Anode MK2M
W2T624757 5/1001 11526 Cell Cathode MK2M
W3T331066 5/1002 11527 Cell Bi-polar MK2M
W2T624759 5/1003 11602 Union body MK2M
W2T624760 5/1004 11599 Union nut MK2M
W2T624761 5/1005 10122 Split collar MK2M
W2T625195 5/1005 10112 O-ring MK2M
W2T624762 5/1007 10123 End cone MK2M
W2T624763 5/1008 11511 Titanium pin MK2M
W2T624764 5/1009 10128 Locating sleeve MK2M
W2T624765 5/1010 11507 Union end MK2M
W2T624788 5/1041 11581 Inner cell spacer MK2M
12624 Flow indicator DN25
12625 Flow indicator DN40





Evoqua PN


Spec PN


W2T630794 6D-16511 6S-13913/3 Shipside valve DN25 ANSI 150
W2T630795 6D-16511 6S-13913/4 Shipside valve DN40 ANSI 150
W2T850076 6D-16511 6S-13913/5 Shipside valve DN50 ANSI 150
W2T630801 6D-16768 6S-13929/3 Shipside valve DN25 EN1092
W2T630802 6D-16768 6S-13929/4 Shipside valve DN40 EN1092
W2T630803 6D-16768 6S-13929/5 Shipside valve DN50 EN1092
W2T631206 6D-19764 6S-30766/2 Shipside valve DN25 JIS 10K
W2T631207 6D-19764 6S-30766/3 Shipside valve DN40 JIS 10K
W2T631208 6D-19764 6S-30766/4 Shipside valve DN50 JIS 10K
W2T625162 6D-17405 6S-13914/2 Check Valve DN25 ANSI 150
W2T625163 6D-17405 6S-13914/3 Check Valve DN40 ANSI 150
W2T802376 6D-17405 6S-13914/4 Check Valve DN50 ANSI 150
W2T630806 4-24357 6S-13930/2 Check Valve DN25 EN1092
W2T630807 4-24357 6S-13930/3 Check Valve DN40 EN1092
W2T630808 4-24357 6S-13930/4 Check Valve DN50 EN1092
W2T631117 6D-17750 6S-30629/2 Check Valve DN25 JIS 10K
W2T631118 6D-17750 6S-30629/3 Check Valve DN40 JIS 10K
W2T631119 6D-17750 6S-30629/4 Check Valve DN50 JIS 10K
W2T821954 6D-19949 6S-32995/2 Diaphragm Valve DN25 ANSI 150
W2T821955 6D-19949 6S-32995/3 Diaphragm Valve DN40 ANSI 150
W2T821956 6D-19949 6S-32995/4 Diaphragm Valve DN50 ANSI 150
W2T821958 6D-19949 6S-32995/6 Diaphragm Valve DN25 EN1092
W2T821959 6D-19949 6S-32995/7 Diaphragm Valve DN40 EN1092
W2T821960 6D-19949 6S-32995/8 Diaphragm Valve DN50 EN1092
W2T625176 4-21329 6S-13536/2 Diaphragm Valve DN25 EN1092
W2T625584 4-21329 6S-13536/3 Diaphragm Valve DN40 EN1092
W2T630722 4-21329 6S-13536/4 Diaphragm Valve DN50 EN1092
W2T630811 6D-19757 6S-13939/1 Diaphragm Valve DN25 JIS 10K
W2T630812 6D-19757 6S-13939/2 Diaphragm Valve DN40 JIS 10K
W2T630813 6D-19757 6S-13939/3 Diaphragm Valve DN50 JIS 10K


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