GWCL only tested the treated water for bacteria, not toxins from algae, and that was why the company said its water was potable.

…although the current water purification mechanism used by the Ghana Water Company Limited (GWCL) met World Health Organisation (WHO) guidelines, the guidelines were accepted at a time that Ghana did not have problems with algae growth in water sources.

 

…algae toxins can cause kidney, liver, nervous system and heart problems.

See why Ghana’s not ready to treat algae

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