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Our water treatment process specialists have the following to say on the query from the field.
Copper is toxic and the health based guideline (WHO) is 2 mg/l and above 5 mg/l it imparts colour and a bitter taste to the water. Metals at low concentrations do limit the growth of bacteria and copper has been used to prevent the growth of algae within raw water reservoirs (this is the application referred to below).
Copper is not a suitable disinfectant for potable water and certainly not a replacement for chlorine.
James Montgomery
