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BLK litmus test shows a pH of 4. BLK is acidic, not alkaline.
I am not understanding the process by which this black water is considered alkaline. When I tested it with a litmus strip it was quite acidic. Please see the attached picture to this review that shows a pH of 4 for the BLK water which is clearly acidic, not alkaline.
August 2015 · Grocery and Gourmet Food