Never tried it, but it sounds philosophically very similar to Skratch's Hyper Hydration mix. Hyper Hydration is a pre-exercise mix that they say has the same osmolarity and sodium concentration as blood-- also the same as a sodium IV bag. I use Hyper Hydration before major sweat activities, and it definitely makes a difference. I never thought about drinking something like this after exercise.

Edit: Oh yeah, it tastes nasty. I nickname it the Dead Sea Cocktail.