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What chemical compounds might be present in drinking water?

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Figure 9 A photograph of a bag of washing powder. On the bag there is a picture of dolphins, and the words:

Environmentally respectful and effective. Ecolabel award. See side of pack for details. Readily biodegradable. Phosphate free. Contains plant-based ingredients. Naturally powerful formula. Money back guarantee. Respects the environment. Down to earth. Concentrated automatic washing powder. e 2 kg.

 3.1 Phosphates in the environment