Total Dissolved Solids (TDS) in Swimming Pools

To keep swimming pool water clean and safe, pool operators use a range of tools and techniques to monitor and control the levels of chemical pollution. A key tool for this is a Total Dissolved Solids (TDS) meter. This devise measures the electrical conductivity of the water. The TDS meter enables pool operators to determine the amount of chemicals that are dissolved in the water. They can use this information to take appropriate action to keep the water quality at an optimal level.

Maintaining the TDS level is critical. It should be well below 1000mg/m3 above the TDS level of the mains water supply. If the TDS level is too high, it can lead to issues such as cloudy water, bad odor, eye irritation, and rashes. To prevent this, pool operators take a proactive approach to minimizing chemical pollution in the water. A reactive response is needed if high chemical pollution is detected.


The most effective way of preventing chemical pollution is through prevention, and this involves minimizing the amount of pollution introduced into the water by bathers. This can be achieved by encouraging bathers to shower before entering the pool, which can reduce the amount of pollutants that they introduce. By reducing the amount of pollution, pool operators can reduce the amount of disinfectant and pH correctant that is required, which can help to maintain the water quality at a high level.

Reducing TDS

Reactive measures can also be taken if chemical pollution is detected in the water. Dilution is a common approach. This involves adding clean, fresh water to the pool to dilute the pollutants. The recommended rate of dilution is 30 liters of fresh water per bather, per day, and this can be an effective way of restoring the water quality to an optimal level.

By taking a proactive and reactive approach to managing the levels of chemical pollution in swimming pool water, pool operators can help to ensure that the water quality remains at a high level.