How can a salty ocean be turned purple?

On my Conworld, the oceans are purple. This is mostly for aesthetic purposes and my current explanation is an abundance of cyanobacteria. I'm not sure that this explains it correctly, so what could explain this realistically? The water doesn't have to be potable, because a scarcity of fresh water is one of the intended characteristics of the conworld.

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How can a salty ocean be turned purple?

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