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If you get too far out of whack, it's often best to just dump and refill. And no, you don't want to adjust too often or you'll just end up chasing the readings. In general, Ph decreaser will lower both Ph and alkalinity.Baking soda can be used to raise alkalinity without increasing Ph (much).Ph increase can be used to increase Ph. Adjust gradually over at least several hours, even the next day.