The rule of thumb is that water should contain an average of ____________ residual chlorine to be potable.

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     0.2 - 0.6 ug/ml
      2 - 6 g/l
      0 g/l
      0.2 - 0.6 mg/ml
asked May 16, 2012 in Microbiology by anonymous
    

1 Answer

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0.2 - 0.6 ug/ml
answered May 17, 2012 by Bioshare ~Top Expert~ (34,070 points)

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