A new comprehensive ecotoxicity study by the Danish Hydraulics Institute (DHI) shows that Exhaust Gas Cleaning Systems (ECGS) do not harm the marine environment. DHI, an independent, international research organization headquartered in Denmark that has special competence in the fields of water, environment and health, took discharge water from four ships operating in northern Europe with open loop scrubbers. The samples were homogenized and presented to different levels of marine organisms including algae & crustaceans in a step-wise process, culminating in testing the toxicity with fish. The final step in the risk assessment is the translation of the data to the real-life situations of several scrubbers discharging into a port or into a busy sea lane. In all cases, the risk of ecotoxicity was well below the unacceptable level. A copy of the study can be downloaded here.