Sorry so late arriving to the party. Since you asked about cleansing, I think Kurt pointed you in the right direction asking for Peaboy's input. We were taught that colon(and GI in general) cleansing is an ineffective, age old practice. I am not familiar with one shred of evidence that 'cleansing' does anything other than make you poop like crazy...I don't claim to know everything, just have been taught to practice evidence-based medicine, and the objective evidence for cleansing does not exist. But it certainly seems to satisfy a psychological need in many to sit on the toilet, so if it floats your boat, go for it. Just be careful what you use-buy your stuff from Peaboy or someone of equally good repute
Here is a simple blurb on the topic courtesy of the Mayo minds
http://www.mayoclinic.com/print/colon-cleansing/AN00065/METHOD=print