While trying to find a good basic explanation of dialysis and how it works for a gentleman at my clinic I came across this article from the Southern Medical Journal by Mitchell H. Rosner, MD and found it to be informative so I figured I would pass it on to those here as well. The article itself is only about 7 pages long but unfortunately I could seem to copy it and get it to post here correctly so I am attaching the PDF file and providing the url as well.
http://www.sma.org/pdfs/objecttypes/smj/F36AD90A-BCD4-FF25-5A2B1FFD5AFE317D/785.pdf