CO2 control with electronic precision. The pH Controller Evolution DeLuxe is part of the highest level of the DENNERLE CO2 system. It continuously measures the pH value in the aquarium electronically and automatically regulates the CO2 supply through the connected solenoid valve. This fully digital precision device offers the highest level of functionality, safety, and comfort. The operation is incredibly simple: one button for one function. The pH controller works in both acidic conditions (e.g., discus fish), slightly acidic conditions (e.g., tropical community aquariums), and alkaline conditions (e.g., Malawi/Tanganyika aquariums, saltwater). The device is completely splash-proof and complies with the latest legal regulations.