RO/DI water is, by definition, water which is extremely low in or free of buffering agents and acids. That means that there is nothing stopping the pH from shifting as a result of any addition of any product, buffer or not. Without the stabilizing influence of a buffer, pH is prone to rapid changes even if the components being added would not typically change the pH. Equilibrium™ does not contain any buffering agents, so adding buffers to this solution should bring the pH to your desired level.
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