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Without dissolved remineralize reverse osmosis water to buffer it, RO water absorbs carbon dioxide from air exposure and drifts toward the acidic end of the pH scale. But how much it changes it, and why, is worth understanding clearly rather than taking on faith. The Mechanism Behind Low pH in RO Water pH measures acidity on a scale from 0 to 14, with 7 being neutral. The mechanism is straightforward. The sharp or slightly dry sensation that some RO water drinkers notice at the first sip is a pH effect. How Remineralization Affects pH Remineralization raises pH in RO water by introducing minerals that act as buffers. Does remineralization raise ph in ro water? Yes, consistently and measurably. Mineral drops raise pH too, but less dramatically than calcite-based cartridges. Alkaline Water vs Remineralized Water Remineralized water is defined by its mineral content, specifically calcium and magnesium concentration. Chasing a high pH reading without regard to mineral content misses the point of remineralization. The useful outcome of remineralization is water with appropriate calcium and magnesium content at a pH close to neutral. What the pH Change Means Day to Day For drinking water purposes, a pH of 6.5 to 7.5 after remineralization is the practical target. pH confirms the buffering effect is working.