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Knowledge centre

Water quality of your pool: pH and chlorine

Maintaining good water quality in your pool is essential for both the health of swimmers and the sustainability of the pool. Two of the most important parameters you need to monitor and regulate are the pH value and the chlorine content.

pH Value

The pH value of your pool water indicates its acidity and should ideally be between 7.2 and 7.6 lie. A pH within this range ensures that the water is pleasant to swim in, without causing irritation to the skin and eyes. Moreover, chlorine, the main disinfectant for swimming pools, works optimally at these pH levels.

  • pH too low (<7.2): This makes the water too acidic, which can lead to eye and skin irritation and corrosion of pool equipment. The water can also become cloudy and the chlorine works more effectively, but this can actually lead to over-chlorination and thus more irritations.
  • pH too high (>7.6): When pH is too high, the water becomes more alkaline, which reduces the effect of chlorine. This can result in algae growth and bacterial infections, making the water cloudy and unsafe.

To correct the pH level, you can add pH-plus (to raise the pH) or pH-min (to lower the pH). It is recommended to measure the pH level regularly, especially after heavy rainfall, hot weather, or intensive use of the pool.

Chlorine content

Chlorine is the main agent for disinfecting pool water. It eliminates bacteria and other micro-organisms that can cause disease. The correct chlorine level in your pool is between 1 and 3 ppm (parts per million).

  • Chlorine content too low: Too low a level reduces the disinfectant effect, leading to an increased risk of bacterial contamination and algae growth.
  • Chlorine content too high: This can cause skin and eye irritation and make the pool unpleasant to swim in.

Chlorine levels are affected by pH; too high a pH reduces the effectiveness of chlorine, while too low a pH enhances the effect. It is therefore important to regularly check and adjust both pH and chlorine levels.

Automatic control systems

For those who want to spend less time manually measuring and adjusting pH and chlorine values, automatic control systems are available. These systems continuously monitor water quality and automatically add the right amounts of chlorine and pH-correcting agents to maintain ideal values.

By keeping a close eye on these values and intervening in time, you ensure a safe and clean pool in which everyone can enjoy swimming.