Possibly. Although if you were to continue adding the same amount of salt each day, the effects would even out over time because your body would be used to having the salt and would only retain the same amount of water.
Yes, just put my biology head on and of course you a right. Just as well as I didnt take any extra salt yesterday and was up all night with leg cramps.
On the positive side, I feel so energised over the past few days! I havent felt this well in years.