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This South African river has a bacteria count off the charts: a natural filter is cleaning it for watering food gardens

A test case in Franschhoek, South Africa has used natural filtering of polluted water to produce 50,000 litres a day that is safe for irrigation.

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A test case in Franschhoek, South Africa has used natural filtering of polluted water to produce 50,000 litres a day that is safe for irrigation.

Water researchers are working more closely with nature – and learning from it – as a means of treating and reusing water.