Corrosion is an immense problem with salt water in large systems.  Eliminating dissimilar metals across so many parts is tricky.  Even then, unless you&#x27;re going to plate everything in gold, corrosion will happen.  The far easier solution is a heat exchanger between the saltwater and some other working fluid (ie radiator fluid) inside the system. I&#x27;m a bit surprised that the hawaii rig is pumping in actual sea water rather than dropping a radiator into the depths.  That intake pipe will corrode eventually.