Could someone tell me if CS is supposed to kill algae?

I have a bottle of purchased CS and I tried putting some in a water decanter 
(clear
glass) which had become infested with algae (bright green). There is still 
algae in
the bottle and it is still bright green!

Does this mean that CS has no effect on algae or does it mean my bottle of CS 
is no
good?

Thanks for any help.

Cheers, Annie

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