I'd say the whole procedure sounds way too expensive. What I would do is fast for one day. Drink plenty of water or juice. That night drink a laxative tea, like Smooth Move. Next morning, still drink plenty of water. Even though you didn't eat anything, you still might have good BM. Drink more water to maintain hydration, then later in the day, when you are sure the laxative has run its course, do a salt water flush. Perhaps prior to that just do a salt water enema.
When I do a liver flush, the next day, I'll do enema around noon and a salt water flush later in the day. It's really effective at cleaning you out.
Of course, what you eat after that will determine what happens the next day. Certanly avoid any meat on that first day after.