My impression from local people who have used a freshwater one in the ocean is that they just rinse it off with fresh water after use. The Saltwater ones are designed for continuous saltwater immersion. Its the seals that are a problem. Maybe if you just spray WD 40 on the seals on a regular basis along with a rinse you should be fine.The second one looks tempting if washing with freshwater after use is all it takes. Am assuming there are the same in most other ways. Did you mean that any freshwater can be maintained well with a rinse off after each use? All comments appreciated.