I see no value for the SWF (Salt-Water-Flush) except during The Master Cleanse when it is needed to continuously flush out the system.
As it flushes out the system, it also flushes out everything that is needed in the digestive tract for proper digestion.
That is why at least two days of orange juice is needed to break that cleanse after only ten days on it.
It is also recommended to add probiotics to the diet shortly after to replenish what has been washed out.
People who don't break that cleanse properly really feel it and some have digestion difficulties for a long time due to not having broken properly.