[starsailor]

I am not sure of the long term solution, but you probably need a professional descaling to get the barnacles out and a regular dose of barnacle buster that you can do to keep it clean.  I see that you are in Florida.  If you are in SE Florida, I can recommend a good company that has done excellent AC work for me.

Thanks for your reply David.  Could you provide me a picture of your A/C raw water overboard outlets.  I am interested in where the factory
relocated the outlets.  Also might help wit my insurance claim..