The Salt Water Flush is part of the Master Cleanse as far as I know. If you are doing an Orange Juice Fast you should follow the instructions for that. Fasts were designed for specific pruposes and it is not a good idea to mix and match elements of different protocols. I'm not sure how enemas fit into any protocol. When I did the OJ fast, after 3 days I was haveing regular BMs with only the Lower Bowel Formula.
If I were you, I would break my fast, go back and read all of the instructions for the various fasts and decide which one I want to do and follow the instructions for one of them exactly.