Guardian Australia tours problematic Malabar wastewater plant where some accumulated fats, oils and grease can’t be accessed – let alone cleared

“This,” says Fiona Copeman, the hub manager of the Malabar wastewater treatment plant, “is what you would call our four-bus area.”

Copeman is gesturing to a model of the plant on a table inside the facility itself. She’s referring to a 300 cubic metre underground chamber that houses, as Guardian Australia revealed in January, a “fatberg the size of four buses that likely birthed poo balls that closed Sydney beaches”.

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