Is reverse osmosis water alkaline or acidic?
Reverse osmosis is a filtration method that removes more than 99% of all the contaminants in water. Within about an hour, a glass of pure RO water can drop from a pH of 7 down to a pH of 5. 5 or lower and become acidic water. Alkaline water has a pH of greater than 7, so reverse osmosis water is not alkaline water.