HowStuffWorks: Reverse Osmosis
- How does reverse osmosis work to purify or filter the water?
- http://www.howstuffworks.com/question29.htm

Home Water Treatment Using Activated Carbon
- Discussion and guidelines from a 1997 article from the Michigan State University Extension.
- http://www.msue.msu.edu/msue/imp/modwq/wq239201.html

Treatment Systems for Household Water Supplies - Activated Carbon Filtration
- 1992 article from the North Dakota State University Extension Service explaining in detail what activated charcoal systems can and cannot do.
- http://www.ext.nodak.edu/extpubs/h2oqual/watsys/ae1029w.htm

HowStuffWorks: Charcoal Filters
- What is activated charcoal and why is it used in filters?
- http://www.howstuffworks.com/question209.htm