re: Spinoff thread....Why use salt in a crawfish boil?

Because there are other variables that premixed bags do not account for; the size of your pot and amount of water you use. Larger pots and more water may benefit from added salt, cayenne, etc. Sure, you could just add a little more seasoning from another bag of premix, but mortons salt and cayenne can get the job done for half the price. And added salt or cayenne may be beneficial for other applications other than your average backyard boil, but that's classified