South Africa’s Stiebeuel River was heavily polluted by sewage; researchers now use stones, sand and biochar to treat 50,000 litres of its water every day

The Stiebeuel River in Franschhoek, South Africa, about 75 kilometres east of Cape Town, has become heavily polluted by sewage and contaminated runoff from the nearby informal settlement of Langrug, where inadequate sanitation has allowed waste to enter the river. E.

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