Phosphorus and nitrogen are essential nutrients for algae growth. The discharge of phosphorus and nitrogen, along with other essential nutrients, stimulates algae growth in the streams receiving the wastewater discharge. Algae causes taste and odor problems, is aesthetically unpleasing and, most importantly, creates enormous oxygen demand when algal bloom dies off. Depletion of oxygen caused by the dying algal blooms is responsible for fish kills and other significant disruptions of the aquatic environment. For these reasons, regulatory agencies often regulate the amount of phosphorus allowed in wastewater discharges.