Gardening question - Activated Sludge

Activated sludge is produced when sewage is aerated by air bubbled rapidly through it. Certain types of active bacteria coagulate the organic matter which settles out leaving a clear liquid that can be discharged or used for irrigation. Activated sludge is generally heat-treated and dried before being sold. It is the method used to produce Milorganite or Hou-Actinite.

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