electrtolysis (IMAGE) Penn State Caption Here is a visual representation of how ion movement is affected by a reverse osmosis (RO) membrane versus a cation-exchange membrane. Chloride ions from the seawater are not able to pass through the RO membrane and oxidize into chlorine gas. Credit Logan Research Group Usage Restrictions Non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.