Phoslock, a modified clay product, is being sprayed into Cromes Broad at How Hill reserve to lock away phosphates which cause algae to bloom.

BBC: Norfolk Broads: Clay technology 'aids How Hill reserve'

We see it every day and we witness it getting worse in our rivers too, where rich furrows of algae now bloom beneath the water.

FORBES: Setting an Innovation Agenda for the Ocean: The Next Frontier for People Like Us

Roses bloom around a kidney-shaped swimming pool, which is green with algae.

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