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You do not use baking soda(sodium bicarb)to raise ph. It is true that ph will raise when adjusting alkalinity(adding sodium bicarb) becacuse it is a base. Alkalinity is a measure of disolved sodium bicarb in water and really has nothing to do with ph other than acting as buffer to reduce ph bounce.Alkalinity needs to be maintained at 125-150ppm even if it takes the ph too high with it. When alk is in range then adjust ph. Soda Ash to raise it and acid to lower it.Not vinegar. Muratic acid works but is a danderous product to use. Dry acid is sold in most pool stores. Never adjust ph unless alk is in range. It wont work.Sodium carborate aka "soda ash" is the same thing. A product to raise ph not alkalinity