HYDROS 2mL/min Dosing PumpThe HYDROS 2mL min Dosing Pump is a simple and affordable pump for automating the addition of liquid supplements, trace elements, and two part solutions to an aquarium. Connect the power of the dosing pump to any simple timer or aquarium controller to completely automate the dosing process. Each pump is capable of dosing a single solution. A 120V timer or controller is required for automatic on off operation, sold separately. HYDROS Dosing Pump