here, I cite from a summary of a Journal of Family Practice article on colon cleansing bunk [see 001., below]:
001. at medpagetoday.com Nancy Walsh reports in "Colon Detox Not Backed by Science"(2011-08-01):
"Ranit Mishori, MD of Georgetown University in Washington, D.C., and colleagues, in the August Journal of Family Practice [...in the article] Mishori R, et al 'The Dangers of Colon Cleansing' J Family Pract 2011; 60: 454-457 [...wrote] 'a search of the literature using the terms colon cleansing, herbal colon cleanse, colon detoxification, and colon irrigation yielded no scientifically robust studies in support of this practice' [...] colon cleansing has been practiced since antiquity as a means of enhancing health through ridding the body of [supposed] toxins [...] users can perform the procedure themselves, but many visit hydrotherapists or colon hygienists [...] Mishori and colleagues outlined three cases of colon cleansing sessions that led to adverse outcomes [...and there have been reports of] air embolism, septicemia, and fatal parasitic infections [...] serious infections and heart failure [...] colon cleansing has no evidence to support its use, and can lead to pain, vomiting, and fatal infections [...specific advice is that] colon cleansing is not medically advisable [...] the devices are not FDA approved and if sanitary precautions are inadequate, infections can result [...] organizations of these practitioners, and the training they receive, are not scientifically regulated."
Note: it is rather ironic that JFP would publish this, being that colon hydrotherapy is an article of faith for naturopathy [they did a crap load of them in ND school during my time there!], and JFP has been quite generous to naturopathy.
[if ever something resembled a feces transplant, it is an infection acquired by use of one of these machines].