I have found that that shakes sort of act as a magnet, and pull out more toxins from the colon than the SWF (Salt-Water-Flush) alone.
I've done the cleanse one time before without the shakes, and it was great-

However this time, after acquainting myself with this forum, I became curious about the shakes.

After eliminating "but pee" only for 3 days- on Day 4, I decided to try the shakes-
Every day after, I have eliminated "ropes" -

I think either way is fine, so long as you are having the BM's...
but, I definitely recommend the shakes-

Good Luck-
(I'm on Day 10 today, woo-hoo!)

The Master-Cleanse fast plus P&B shakes is called the Ultimate fast. :) And it IS the ultimate.

Your digestive system is still getting a break because the psyllium is not actually digested, it's just *moved.* It helps the Master-Cleanse because the fiber and clay lets your body know that it's okay to dump toxins into your bloodstream and colon because the fiber and clay are there to take it all the way out of your system. It will also help to take old bile out of your stomach and small intestine. If you're afraid of overworking your system, just take one shake a day instead of three.

Hope that helps! :)