Raising Pool Alkalinity: How Much Baking Soda or Soda Ash Do You Need? Baking soda and soda ash are both common pool chemicals, but they are not interchangeable. Sodium bicarbonate, commonly known as baking soda, is primarily used to raise total alkalinity while having a relatively small effect on pH. Sodium carbonate, commonly called soda ash, has a much stronger effect on pH and also increases alkalinity to some degree. Choosing the correct product starts with...
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