The CoralVue HYDROS Sole is an innovative aquarium controller and heavy-duty liquid dosing pump hybrid, engineered for continuous dosing applications in both saltwater and freshwater setups. This versatile device excels at tasks such as precisely controlling effluent in calcium reactors, automating kalkwasser additions, administering liquid foods, feeding sulfur reactors, and performing routine water changes. It can operate independently or seamlessly integrate with other HYDROS devices to expand your aquarium's automation capabilities, sending alerts and notifications as needed. Equipped with one robust, continuous-duty liquid dosing pump, the Sole boasts quiet operation and a durable stepper motor designed for sustained use. The pump is capable of running in reverse and features 1/4" push-fit fittings for easy setup and maintenance. It supports tubing sizes of 3 x 5mm and offers a wide range of pump set speeds from 0.1 to 300 mL/min, ensuring accurate delivery. The package includes the Sole Controller, its power supply, and a calibration beaker, all within a compact 6 x 3.6 x 4.125 inch footprint. This product is an excellent choice for reef aquarists and freshwater keepers seeking to enhance their tank's stability and reduce manual intervention through precise, automated liquid dosing. Whether you're maintaining critical water parameters with a calcium reactor, supplementing nutrients, or performing scheduled water changes, the HYDROS Sole provides a reliable and flexible solution. Its ability to function as a standalone unit or part of a larger HYDROS ecosystem makes it ideal for hobbyists looking for advanced, user-friendly automation.