Resources

http://home.howstuffworks.com/home-improvement/plumbing/sewer3.htm

https://en.wikipedia.org/wiki/Septic_tank

http://www.health.gov.au/internet/publications/publishing.nsf/Content/ohp-enhealth-manual-atsi-cnt-l~ohp-enhealth-manual-atsi-cnt-l-ch2~ohp-enhealth-manual-atsi-cnt-l-ch2.3