Enter the total alkalinity, desired total alkalinity, and volume of the pool into the calculator to determine the acid demand.

Acid Demand Formula

The following formula is used to calculate the acid demand in a swimming pool.

AD = (TA - DTA) * V * 0.0015


  • AD is the acid demand (liters)
  • TA is the total alkalinity of the pool water (ppm)
  • DTA is the desired total alkalinity (ppm)
  • V is the volume of the pool (liters)

To calculate the acid demand, subtract the desired total alkalinity from the current total alkalinity. Multiply the result by the volume of the pool, then multiply that result by 0.0015. The result is the amount of acid needed to reach the desired total alkalinity.

What is an Acid Demand?

Acid demand refers to the amount of acid required to lower the pH level of a solution, substance, or environment to a desired level. This term is commonly used in water treatment processes, swimming pool maintenance, and soil testing. The acid demand is determined through a test which helps in maintaining the correct pH balance, preventing potential damage or harmful reactions.

How to Calculate Acid Demand?

The following steps outline how to calculate the Acid Demand (AD).

  1. First, determine the total alkalinity of the pool water (TA) in ppm.
  2. Next, determine the desired total alkalinity (DTA) in ppm.
  3. Next, determine the volume of the pool (V) in liters.
  4. Next, gather the formula from above = AD = (TA – DTA) * V * 0.0015.
  5. Finally, calculate the Acid Demand (AD).
  6. 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.

TA: total alkalinity of the pool water (ppm) = 150

DTA: desired total alkalinity (ppm) = 100

V: volume of the pool (liters) = 5000