Anytime using salt or an acid based solution, you should always use a NON_REACTIVE container. This would include Aluminum and cast iron.
Stainless, Glass, and Food Safe Plastic are fine.
I use Stainless Steam Table Pans Full or Half with a food liner for small cooks, or meat lugs with liners for larger cooks. The food safe liners make clean-up a breeze. They stack easy and can be stored easy as well.
Half Size pans
Meat Lugs and Liners