Well, after a short search and talking to a Naturopath about the SWF, this is what I was told/found out:
Salt Water Flush is good anytime. During the weaning off of the Master Cleanse, one should do the SWF (Salt-Water-Flush) every day until The Master Cleanse is no longer being used (i.e. some people use The Master Cleanse in the morning for breakfast and sometimes for lunch for a long time) and then it's safe to use it every other day, every 3 days, every 4 days or once a week, but everybody should SWF (Salt-Water-Flush) at least once a week, irregardless (if they can handle it) because it's a part of a healthy lifestyle, so I'm going to continue on with it even though I don't like it, but have gotten used to it.