Enter the pool volume and the desired alkalinity increase into the calculator to determine the amount of sodium bicarbonate needed to achieve the increase.

Alkalinity Increase Formula

The following formula is used to calculate the amount of sodium bicarbonate needed to increase alkalinity. 

AI = (PV * DI) / 1.5

Variables:

  • AI is the amount of sodium bicarbonate needed (pounds)
  • PV is the pool volume (gallons)
  • DI is the desired alkalinity increase (parts per million, ppm)

To calculate the amount of sodium bicarbonate needed, multiply the pool volume by the desired alkalinity increase and divide by the factor 1.5. This factor converts the volume of water in gallons to the weight of sodium bicarbonate in pounds needed per ppm of desired increase.

What is Alkalinity Increase?

Alkalinity increase refers to the process of raising the total alkalinity of pool water to the appropriate level, which is typically between 80-120 ppm. Total alkalinity is a measure of the water’s ability to neutralize acids and maintain a stable pH level. Increasing the alkalinity of pool water is important for preventing fluctuations in pH and maintaining a healthy swimming environment.

How to Calculate Alkalinity Increase?

The following steps outline how to calculate the amount of sodium bicarbonate needed to increase alkalinity.

  1. First, determine the pool volume (PV) in gallons.
  2. Next, determine the desired alkalinity increase (DI) in parts per million (ppm).
  3. Next, gather the formula from above = AI = (PV * DI) / 1.5.
  4. Finally, calculate the amount of sodium bicarbonate needed (AI) in pounds.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

pool volume (PV) = 10,000 gallons

desired alkalinity increase (DI) = 10 ppm