DON'T GET IT WET! I use a CZ-5 as my main land unit. I hunt in SALT mode all the time anyway, to help with mineralization in the dirt. SALT mode does lower the Sensitivity slightly, and you may not hit on smaller gold items as strongly while in SALT mode.
A couple of other pointers: Switch to SALT mode BEFORE you ground-balance the unit. You should always redo the GB when you switch from NORMAL to SALT and back. Also, GB where you're going to hunt. If you're hunting the wet salt sand, GB in the wet salt sand. If you're searching the dry stuff, GB there. Also, from what I've read, you can probably expect more depth in wet salt sand than on dry land. This is because the wet salt is conductive. Another point, about GB'ing, is that you can expect a radically different position on the knob than what you're used to. Remember, the Gulf Coast doesn't have a lot of minerization, so you can expect a wide area of arc on the knob to give you a "sweet" ground-balance.
HH from Allen in OK