Newbie Question...Antifreeze to use on engine nd genny raw water side

[fdough1]

OK...I have looked on the site but can't seem to see the answer to my question. Specifically, when I run anti-freeze thru the raw water cooling side of the engine and genny it will be pumped overboard. So is there a type of antifreeze that is safe to pump into the water.

Thanks

 

[ZZ13]

Buy the propylene glycol stuff made for RV and boat winterization. You can get it at RV or marine stores. Do not buy the ethylene glycol stuff that goes into radiators of cars (sold at auto parts stores and department stores with auto sections).