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Many countries require the removal of phosphates from all waste. The reason for this is that phosphates promote the growth of cyanobacteria (blue-green algae) causing eutrophication, where the level of cyanobacteria means that other organisms cannot breed.

Interestingly, further studies have shown that eutrophication only occurs in cases where the organisms that feed on cyanobacteria, such as zoo-plankton, are absent. This is usually the case due to other pollutants, such as heavy metals or pesticides

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