Replied by Ted (Bangkok, Thailand)
Dead sea salt or Himalayan sea salt works about the same. The key to make it work better is to add drops of H2O2 3% per 1/2 glass of water at about 5-10 drops. Usually a psoriasis can be helped further by adding a small amount of baking soda too. Mine was helped by just taking 1/4 teaspoon of baking soda and 1/4 teaspoon of sodium carbonate (washing soda) in 1/2 glass of water taken three times a day for a couple of day and it just disappeared too. Sea salt kills the pathogens by salinity but interestingly most sea salt are alkaline anyway.
As for me I don't use Dead sea salt and Himalayan sea salt that often and I just used a local Thai sea salt and it works fine too, but that's perhaps I added some 3% H2O2 to the mix, such as 10 drops per glass of water in a sea salt solution.