Wastewater has organic substances and other pollutants that must be eliminated before the water can be recycled back into natural water bodies. Primary treatment involves eliminating large-sized solid and gritty matter from the water, whereas secondary treatment involves using microorganisms to decompose organic matter left in the water. The biological treatment of wastewater could occur through various ways depending on the presence or absence of oxygen in the process. The various treatments include aerobic, anaerobic, and anoxic treatment. Anoxic processes help address compounds such as nitrates and sulfates. Lakeside Equipment Corporation covers these treatment methods and equipment used in wastewater processing.