A reader asked me about doing this. I have no personal experience (I am sure some readers will add their own experiences to this post). I did find a few items on Pub Med
The preliminary clinical trials and animal experiments show that the probiotics biologicals from Lactobacillus acidophilus or Bifidobacterium, and the prebiotics including inulin and galactooligosaccharides, as well as lubiprostone and activated carbon adsorbents can be used for improving dysfunction of CKD patients with the gut microbiota dysbiosis via reducing uremic toxins and inhibiting the systemic micro-inflammation. But not only that, it is reported that, to some extent, a number of the single Chinese herbal medicine（CHM）, the CHM prescriptions and the CHM extracts（emodin, etc.）with oral or enema administration can also regulate the gut microbiota dysbiosis, protect the intestinal epithelial barrier, reduce uremic toxins accumulation and delay CKD progression.[Pathomechanism and treatment of gut microbiota dysbiosis in chronic kidney disease and interventional effects of Chinese herbal medicine]. 2017
- Randomised clinical trial: the effectiveness of Lactobacillus reuteri ATCC 55730 rectal enema in children with active distal ulcerative colitis. ” In children with active distal ulcerative colitis, rectal infusion of L. reuteri is effective in improving mucosal inflammation and changing mucosal expression levels of some cytokines involved in the mechanisms of inflammatory bowel disease. “
- Effects of budesonide and probiotics enemas on the systemic inflammatory response of rats with experimental colitis.  ” Probiotics are effective to diminished inflammatory status mediated by IL-6 in experimental colitis. “
- Clinical trial: probiotic treatment of acute distal ulcerative colitis with rectally administered Escherichia coli Nissle 1917 (EcN)  ” Enemas with 40 ml EcN seem to be most promising. “
No adverse reactions were cited. Results were either positive or none. It presents an interesting alternative for some people.