Enemas don't go as deep. The only comparison to a colonic is a colema. You can buy a colema board and do it at home. The price is kind of equal as you would pay for 2 colonics.
You can google it and some sites have a video about it.
I like my colema board but I find I use it less, because I like the cleaning of the Oxypowder . And now I am trying the LLB I bought from The Barefoot Herbalist.
I like to clean the small intestines as well as the large bowel.