The water flux of the membranes at 25 °C had a decreasing trend for all of the membranes in three cycles as well.
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Comprehensive Characterization of Commercial Reverse Osmosis Membranes through High-Temperature Cross-Flow Filtration.
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The sentences
The water flux reached the highest value with different rates, where AG and AD showed the lowest and highest ratios of water flux at 75 °C to the water flux at 25 °C, respectively. We noticed that the membranes with a higher flux ratio in the transition zone (25–75 °C) had a lower flux decline at 75 °C. The NaCl rejection had an increasing trend for all of the membranes when the temperature increased.