CO2 or carbon dioxide can be used to adjust pH safely without the use of hazardous chemicals and is also an economic alternative to acids and oxides. The process of adding carbon dioxide to water using gas diffuser(s) converts the carbon dioxide to carbonic acid in the water, consuming alkalinity, thereby decreasing the pH. Please email our sales representative for information on CO2 supplies. You can also go to our equipment section of our products list and review our pH control systems.