The Saffier was equipped with an HDS40-100. That is 4 x 100 Watt transducers. Maintenance staff made use of regular maintenance -and cleaning- of the box coolers to install the ultrasonic anti-fouling system.
After all, an ultrasonic anti-fouling system requires that the box coolers be clean before the system is installed. Ultrasonic sound cannot remove marine fouling once it has settled. Also here, the transducers are glued directly on the water covers of the box-coolers.
Very neat installation, look at the transducer cable guidance!!!