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An Introductory Guide to Installing a Septic Tank and Drainfield (English) – New Mexico State University 2005 – – Video furnished by Media Productions, New Mexico State University. Noncommercial use only. Wastewater from home not only causes unpleasant odors, but also contains impurities and pathogens, which contaminate drinking water and cause serious health problems. This video shows you step by step how to properly install a home sewage treatment system, consisting of a septic tank and a drainfield, to help protect the health of you and your loved ones.