What is negatively charged water? Well first you need to understand what redox potential is!redox potential = the ability of a substance to release or accept electrons. Now, water with a negative charge means that the redox potential of the water, measured in mV, has an EXCESS of electrons = energy. Water with a positive charge means that the redox potential of the water, measured in mV, has a LACK of electrons = lack of energy. And since our Aquaporins are positively charged, they only ALLOW NE