http:www'greywater'compollution'htm

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http//www.greywater.com/pollution.htm
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• Greywater is washwater. That is, all wastewater
  excepting toilet wastes and food wastes derived
  from garbage grinders. There are significant
  distinctions between greywater and toilet
  wastewater (called "blackwater"). These
  distinctions tell us how these wastewaters should
  be treated /managed and why, in the interests of
  public health and environmental protection, they
  should not be mixed together.

http//www.greywater.com/pollution.htm
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Greywater and Blackwater Key differences

• Greywater contains far less nitrogen than
  blackwaterNine-tenths of the nitrogen contained
  in combined wastewater deriveves from toilet
  wastes (i.e., from the blackwater). Nitrogen is
  one of the most serious and difficult-to-remove
  pollutants affecting our potential drinking water
  supply.
• Greywater contains far fewer pathogens than
  blackwaterMedical and public health
  professionals view feces as the most significant
  source of human pathogens. Keeping toilet wastes
  out of the wastewater stream dramatically reduces
  the danger of spreading such organisms via water.
• Greywater decomposes much faster than
  blackwaterThe implication of the more rapid
  decomposition of greywater pollutants is the
  quicker stabilization and therefore enhanced
  prevention of water pollution

http//www.greywater.com/pollution.htm
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