Since your line is in constant contact with the inside of each eye, it's really the most important part of your rod needing to function properly. Speaking of line, your line is the most important part of your terminal tackle. I'm a fanatic about my line. It's all that stands between you and the fish you' ve just hooked. You can have all of the other equipment in good working order but it won't do you any good when you tie into a big trophy trout if you don't have fresh, high-quality line spooled on your reels.
Salt water is extremely harsh on monofilament, much more so than fresh water.
I once read a study that found just how corrosive salt water actually is to various metals, plastics and monofilaments. For this reason, I use a high-quality line capable of holding up under harsh conditions. Berkley Trilene, in my opinion, performs flawlessly and is available in a wide range of selections for inshore anglers. Remember, no monofilament can stand up for too long to the elements, so be sure to change your line often. The worst-case scenario is to use line that has sat up on your reel for long periods of time or line that has developed excessive memory.