Soaking things in the real ocean almost always leads to unwanted results of a biological nature. While I’m not saying teredos will tunnel out your graphite, it can still be colonized by an amazing variety of creatures you would probably refer to as ‘slime’.
I would actually call it “biofouling”. But that is another can of worms that is fairly well described in trade literature. Typically handled by additives (though that consumes stuff). I’d suggest going the energy way - ultrasound-grind the critters that would want to attach, ultraviolet lamp, or high-power xrays or electron beam. Or maybe pulsed electric field. Anything that the critters dislike.
Edit: Linked the pulsed electric field food pasteurization technique. Looks to me like it could be usable for anything where microorganisms have to be kept in check. Here, the graphite plate can be itself an electrode.
On this site, you would have to use Blackwing 602s at $20/dozen
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