There is no such thing as "Saltwater Proof", instead some fly rods, reels a & and fly lines are "Saltwater Resistant". You can use the normal fly rod, reel, and fly line that you use in freshwater as well as saltwater. The only thing you have to do, is after fishing for the day, is to remove the reel & line from the fly rod and place the reel and line inside a bucket with fresh water to soak overnight. Then the next day wipe it down (inside and out, and apply lubrication (as needed to the inside workings on the reel)! As for the fly rod, you need a trough that is long enough for your fly rod (with the sections broken down) to soak in fresh water.

When you are done fly fishing in the salt, you repeat the above, but you soak all the components for a seven days, remembering to dump all the previous days water out of the bucket and trough, and refill with new fresh water.

Then you allow all the components to air dry, before storing them away (remembering to check the inside of the reel for adding lubrication as needed). This is PMCS ( Preventive Maintenance, Checks and Services) doctrine.

If you do PMCS on a daily bases, when fly fishing (saltwater or freshwater) you fly fishing gear will last you a life time. ~Parnelli