very good .  importance is of this order.   a.  odor.  b presence of garbage or things not supposed to be there.  like flammable material etc  c. metals.  d appearance,...black, brown, green and clear.  e.  DO levels.  f.  cyanotoxins and cyano bacteria.  g. nutrient levels. h  presence of life.

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very good .  importance is of this order.   a.  odor.  b presence of garbage or things not supposed to be there.  like flammable material etc  c. metals.  d appearance,...black, brown, green and clear.  e.  DO levels.  f.  cyanotoxins and cyano bacteria.  g. nutrient levels. h  presence of life.