Hycrete's additive is based on a water-soluble molecule that transforms when mixed into concrete, becoming a water-repellent polymer.

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Rosenberg's grandfather Michael Rhodes was a chemist who in the 1950s led the invention of the water-repelling molecule at the heart of Hycrete's additive.

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MTBE, an additive mixed with petrol to reduce air pollution, had caused it to leak into water supplies.

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