The Fiobuoy’s patented release mechanism is designed in a way to ensure fouling does not affect its release. Many acoustic releases are designed with a mechanical arm, so when they are opened debris and seaweed etc can get caught on the arm preventing the line to be released. The Fiobuoy was designed with a jaw and ball-pin, not an arm. This means that when the release is actuated the jaw opens, releasing the pin and pushing any growth away.
However, if you are deploying in areas where high amounts of growth is expected, for instance in shallow or warm waters, you may need to consider marine growth on the rope spool. To prevent this Fiomarine recommends, and can supply, an application of an antifouling agent on the outer layer of rope.