Taylor Balance

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Taylor balance: calco-carbonic balance

The Taylor Balance is used to determine the calco-carbonic balance for optimal water quality in swimming pools. If this balance is not found and maintained, it can lead to:

            • a very fluctuating pH,
            • whitish deposits on the walls,
            • cloudy water.

What is the calco-carbonic balance?


The balance of water in a swimming pool is difficult to maintain. To do this, it is necessary to determine the right calco-carbonic balance.

The Taylor Balance is a tool to determine the balance to be achieved between:

  • TAC: Full Alkalimetric Title corresponding to the quantity of carbonates and bicarbonates in the water. It is expressed in °F or ppm (1°F = 10 ppm). It characterizes the buffering capacity of water. The TAC must be between 10 and 30°F,
  • TH: Hydrotimetric Title corresponds to the quantity of calcium and magnesium (limestone) in the water. It is expressed in °F or ppm (1°F = 10 ppm). The TH characterizes the hardness of the water. The TH must be between 10 and 20°F,
  • pH value: The pH is the hydrogen potential of the water. It measures the acidity of the water from 0 to 14.

The ph remains the easiest element to correct. The biggest challenge will be to stay within the efficacy range of the disinfectant used.

Checking frequency:

  • At the watering of the pools,
  • then once a quarter.
traitement de l'eau

How to use the Taylor balance?

Determine the calco-carbon equilibrium

To determine the calco-carbonic balance of water using the Taylor Balance, the method to follow is:

  • Measure the TH and TAC with a portable photometer,
  • Then, point the results on the Taylor scale on the left and right scales,
  • After that, draw a line between the two results,
  • Finally, the graph indicates the ideal pH to try to reach on the pool in order to be in calco-carbonic balance.

The objective is to comply with regulations with a pH between 6.9 and 7.7 and generally between 7.2 and 7.4.

However, it is sometimes easier to act on other parameters such as TH and TAC.

Indeed, if, for example, the TAC is 15°F and the Th is 9°, this gives an ideal pH according to Taylor’s Balance at 7.8. However, if the pH target is 7.2, it will be necessary to act on the TAC rather than on the pH in order to lower it. This will also avoid using too much acid to achieve the desired pH objective.

Balance de Taylor

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