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CO₂ in swimming pools
By the use of sodium bleach for the disinfection of swimming pool water, an acid is needed to maintain the level of the pH-value. CO2 is the perfect product by its chemical properties and low cost.
Applications
Swimming pool water is an ideal breeding ground for bacteria and fungi because of the elevated temperature. That is why it is an absolute necessity to provide a disinfection installation. The most commonly used disinfectant for this application is sodium bleach.
In the event of a too high level of acid pH (< 5) the hydrogen hypochlorite or under chloric acid is converted into the toxic chlorine. For optimum operation of the hypochlorite, it is therefore important that the pH of the pool water is kept between 6.5 and 7.
Why has the pH of swimming pool water the tendency to move to be alkaline (pH > 7)? Swimmers bring sweat, soap residues, possibly urine in the water which will increase the pH. In addition, the used chlorine bleach is alkaline by the presence of sodium hydroxide (11<pH<14). Therefore, an acid should be added to return to the ideal disinfection area of the hydrogen hypochlorite. A very suitable product for this is CO2.
CO2 can be used in any swimming pool where the disinfection happens with chlorine bleach.
Requirements
- CO2-frame, sphere or tank
- evaporator
- pipe decompressor
- pH-metre
- CO2-injector, controlled by a pH-metre
The gaseous CO2 is dosed in the bathing water pipe between the pump and heat exchanger. Typical annual consumption for a 25 meter-pool is + /- 12 tons of CO2.
IJsfabriek Strombeek has for decades been a point of reference in the field of CO2. In addition to the required CO2 we can also provide all equipment. Our team of engineers are ready with all their experience and expertise to help you organise your project.
Advantages
- CO2 is a weak acid. The risk of a too strong acidification (pH<5) is much smaller than with the use of strong acids such as HCl, whereby formation of the highly toxic chlorine gas is avoided (see figure).
- Simple and safe dozing.
- Cost effective in comparison with other acids.
