It is anticipated that the Evac Evolution system will gain U.S. Coast Guard Type Approval before the end of 2018 and attain Type Approval to IMO revised G8 standard in the following months.

Based on a combination of filtration and UV technology, the system was developed by Cathelco which was acquired by the Evac Group in May 2018.

Features of the Evolution system


Enhanced UV chamber design

The UV reactor is designed to increase the level of irradiation to meet the U.S. Coast Guard ‘live/dead’ standard, whilst other features extend the exposure time with the sea water. In addition to creating a helix flow as the water enters the reactor, its path is interrupted to cause a lateral movement. This brings organisms from the edge of the flow into closer contact with the light emitted from the UV lamps in a repeating cycle as the water passes along the chambers.


Precise adjustment to different water qualities – saving power

Maximum power is only used when the circumstances demand such as when the ship is operating in heavily silted waters within harbours and estuaries.

A UV Transmission sensor measures a sample of sea water before it reaches the UV chamber and registers the amount of UV light actually passing through it – a very accurate way of calculating the correct UV dose. This works in conjunction with UV intensity meters which are mounted on the chamber wall and measure the intensity of light which is received. As soon as the water quality improves, the power to the lamps is reduced saving on overall power consumption.


Your ships can go anywhere without restriction

Because the Evac Evolution system is effective in marine, brackish and fresh water there is no limitation on the areas where your vessel can trade. It can operate in the Great Lakes, inland waterways and estuaries, whilst also remaining effective in seawater temperatures down to minus 2 degrees C.

Effective in challenging water conditions

Some BWMS struggle to work effectively in the heavily silted water found in harbours.  The Cathelco system has proved to be effective in waters where UV light transmittance is as low as 45%. This compares with normal seawater UVT levels of 75%.

Stepless power control – saving energy

In many BWMS, power to the lamps is increased in large incremental steps with inevitable wastage. In contrast, the Evac Evolution system uses the latest switchmode technology to provide a ‘linear’ power supply. This means that the demand from the lamps is met in much smaller steps without excessive and unnecessary use of power. As the power output is linked to data from the UV Transmission and UV intensity meter feed-back loop, the optimum amount of power is used at all times.


Easy, intuitive controls

The control system is easy and intuitive to use. Schematics show the routing of the water through the pipework and readings are immediately available from all of the sensors. It is also shows the transition state of valves, giving engineers a complete picture of how the system is performing.

Worldwide support for your system

Cathelco, now part of the Evac Group, has been serving the marine industry for over 60 years and has established a network of agents in ports around the world, plus subsidiaries in India, Korea, Singapore and the UAE. Your BWMS has the support of experienced engineers together with access to a complete range of consumables. Evac has 40 years’ experience of serving maritime markets with offices in 14 countries across four continents and representatives in 70 countries, available to provide comprehensive installation and service support.