What to do if i need to cleanse my colon, what to buy?

Don't need to: There is a whole market of products available to cleanse colons. I would focus on using fiber, and taking probiotics. I think too many colon cleanses are likely more harm than good, and there is no really good evidemnce to support this practice. I have had some patinets do this, and they state they feel better, but from a literature standpoint, can't really recommend it.