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I have used both Cathelco and Marelco systems in the past on yachts of 60 -75 Meters and the experience has been very good. In one case we retrofitted system as we were having fouling problems on the main sea chest, the results were amazing a pipe that had been regularly choked remained clear.
These systems do not replace traditional zincs altogether however they are great at keeping clear areas where there is a constant flow (and therefore fouling problems) ie A.C. seawater intakes. Generally they are mounted in pairs one copper and one zinc alloy they are connected to a central control panel in the engine room.
The anodes are bolted through the hull with a single stud replacing them is a bi-annual drydock job. I have changed one damaged anode whilst in the water using a diver however itīs not to be recommended.
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