Article: Carbon dioxide, or CO2, can safely and effectively lower and stabilize your pool’s pH. A variety of CO2 systems for pools are available, some of which can automatically analyze your pool’s pH and adjust their output accordingly. These devices are available through specialty pool and spa supply stores.  Some CO2 systems are fully automated, while others have to be controlled manually. Consult a specialist at a pool supply store to determine what type of CO2 system is best for your pool. These systems can be expensive, ranging in price from $300-$10,000 USD. However, a CO2 system may ultimately save you money, since it minimizes the need for frequent pH and chlorine adjustments. Unless you have a lot of experience installing pool equipment, it is probably best to have a pool technician install the CO2 system for you. Consider consulting a professional before you purchase a CO2 system, so that they can help you determine whether the system is a good fit for your pool. Since CO2 can raise your pool’s total alkalinity, it is best not to use a CO2 system if your water already has a high total alkalinity (i.e., if water tests reveal it is over 125 ppm). CO2 is also less effective at lowering pH if your water is hard. Consult a pool technician to determine if your water conditions are right for a CO2 system.
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Purchase a CO2 system for safer pH control. Have a professional install your system. Avoid using a CO2 system if your water is hard or high in total alkalinity.