General Cooking Questions

I got to thinking today . . . saltwater can be desalinated by distillation.  In fact, distillation is a process that's used to remove all contaminants from water.

So, am I wasting my time by salting the water I use to steam veggies or to reheat previously frozen crab legs?  I'm thinking the salt would be left behind in the water component & the pure water steam would wash off any salt I'd place on the food itself.