Sounds like the ratio of salt to water may not be working for you.
Per the book, you may need to experiment (witht e ratios) and see what works best for you.
I only do the SWF (Salt-Water-Flush) only on weekends on the cleanse. Fortunately, my body does not absorb the salt. The SWF (Salt-Water-Flush) has helped me eliminate headaches, etc... when I am on the cleanse but I don't do it very often. Also because I drink the P& B shakes and I want to give them enough time to do their job and not be flushed out by SWF (Salt-Water-Flush) too soon.
Sounds like SWF is not working so well for you. Personally, I love it and it works very well but we are all different. Good luck to you.