So, if very few service companies are purchasing soda ash, one can extrapolate that either the pH in swimming pool water is never low, or individuals are using sodium baking soda to adjust pH. Using sodium bicarbonate to raise pH is the equivalent of driving a nail into a wall using the handle of a screw driver - it can be done, but a hammer would handle the job more effectively and at much less of a cost. Sodium carbonate will actually have a dramatic effect on both pH and total alkalinity. Using sodium bicarbonate will have a more measurable effect on total alkalinity, while only raising the pH of water slightly. Understanding that it is impossible to raise (or lower) one without effecting the other chemically, there is still a “right tool for the job” analogy that comes into play.
The industry standard has always been to use sodium bicarbonate (baking soda) to raise total alkalinity and sodium carbonate (soda ash) to raise pH - the exception being if both total alkalinity and pH are low. “You know you’re the only one who buys that,” the counter person at my local distributor would say as he headed to the warehouse to pull a 50-pound bag of soda ash.
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