Julios Kontchou carefully slips on the white protective suit, slips on a pair of blue laboratory gloves and pulls the tree-frog-green jacket with the distinctive Greenpeace lettering over his T-shirt. "The whole body has to be covered for safety reasons, after all we don't know what's in the water here," says the ecotoxicologist. Using a large trowel on a five-meter-long telescopic pole, he scoops water from a side canal of the Oder near Olawa from the bank.

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