If the salt is REAL with all its minerals, I have no problem with salt. How often you would do a flush this way would be based on how well you feel and then want to do it, your body will let you know when it has done enough.
Some of the oldest living people drank 20-30 cups of tea per day with a lump of whole salt in each cup. That is like 30 tsp. of salt per day, every day. They eat zero food. The main thing we want is raw minerals and true salt is a very good source, it is only when we refine salt or use salted foods and wrong foods that salt becomes a problem.
My very best medical doctor is all of this world, was in deed a salt-cure doctor and his methods will be part of my little schooling down the way, so I am a big believer in the use of salt.