I have done this cleanse MANY times and have never used the salt water flush as I can't stand to drink it. Are you drinking the herbal laxative tea? If not, do! You have to get the salt/water proportions exactly right in order for it to have the same weight as blood and hence push everything in it's way - out. If you can do both, even better.
That said, this cleanse is designed to bring your body weight into balance. If you are not losing weight even though you are drinking enough tea, etc., then that is your body telling you it wants to be where it is! :) Maybe try "BodyFlex" program which literally can shed inches off of your body in one session. Easy to do, and a great tool for breathing right, anyway.