It is not necessary. If you feel sick after a coffee enema then do it. The peristaltic motion induced by the coffee enema should be enough to release the toxins out of the body. In some cases, however, the toxins are not released but remain in the small or large intestine and are re-absorbed. I think this happened to me a couple of times and is the reason for my feeling sick after coffee enemas initially. So I now do a salt water enema after CEs.