It turns out that copper is vital to the survival of algae and photosynthetic bacteria (better known as black algae). So why do algaecides contain copper?
A little is vital, too much is deadly. It is a bit of a Trojan Horse effect. The algae will readily take in copper, but if it takes in too much then the copper will interfere with the Calvin cycle (i.e. the photosynthesis process whereby carbon dioxide is converted to sugar.)
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