Hydranautics HYDRACoRe® (Hydranautics Color Removal) membranes are sulfonated polyether sulfone-based spiral-wound, crossflow elements that can be used for potable water as well as industrial applications in which color reduction with minimal removal of dissolved salts is desired. The key advantage of the HYDRACoRe® technology is the membranes’ superior chlorine tolerance (up to 100 ppm chlorine during short-term cleansing)