Using carbon dioxide (CO2) for pH control in pools is becoming increasingly popular due to its safety and effectiveness. However, there are several misconceptions about this method that can lead to confusion. Let's debunk some of the most common myths surrounding CO2 in pool pH management.

Misconception 1: CO2 is Dangerous to Handle

Reality: CO2 is actually safer to handle compared to traditional acids like chlorine, muriatic acid or sodium bisulphate. It is a colourless, odourless, non-flammable gas that does not pose the same risks of burns or toxic fumes [1]. Properly installed CO2 systems are designed to safely introduce the gas into the pool water without direct handling by the operator [1].

Misconception 2: CO2 is Ineffective for pH Control

Reality: CO2 is highly effective for pH control. When CO2 dissolves in water, it forms carbonic acid, which lowers the pH in a controlled and gradual manner [1]. This process is gentler and more stable than using strong acids, which can cause rapid pH fluctuations [2].

Misconception 3: CO2 Systems are Expensive

Reality: While the initial setup cost of a CO2 system might be higher than purchasing traditional acids, the long-term benefits and savings are significant. CO2 systems reduce the need for frequent chemical adjustments and minimize wear and tear on pool equipment [1]. Over time, this can lead to cost savings and a more sustainable pool management approach [2].

Misconception 4: CO2 is Not Suitable for All Pools

Reality: CO2 is suitable for most pools, but there are exceptions. Pools with very high alkalinity or calcium hardness may not benefit as much from CO2 pH control [1]. Additionally, pools with extensive water features that cause rapid CO2 off-gassing may require alternative pH management strategies [1]. It's important to assess the specific conditions of your pool before deciding on CO2.

Misconception 5: CO2 Causes Pool Water to Become Acidic

Reality: CO2 helps maintain the pH within the ideal range of 7.2 to 7.8, which is neither too acidic nor too basic [1]. The carbonic acid formed by CO2 is a weak acid that stabilizes the pH without causing the water to become overly acidic [2]. This balance is crucial for swimmer comfort and the longevity of pool surfaces and equipment [1].

Conclusion

Understanding the facts about CO2 in pool pH management can help pool managers make informed decisions. CO2 offers a safer, more sustainable, and effective method for maintaining optimal pH levels, ensuring a pleasant swimming experience and protecting pool infrastructure. By debunking these common misconceptions, we can appreciate the true benefits of CO2 in pool chemistry.

References

[1] The Science Behind CO2 pH Stabilization in Pools | Poolsmith

[2] The Role of Carbon Dioxide (CO2) in Swimming Pool Water, part 1

Air Products is a global leading industrial gas supplier and specialists in swimming pool pH control systems. If you are interested in exploring how we could help you switch from chlorine to CO₂ and provide a safer swimming pool environment, please get in touch.