The HYDROS Sole is an aquarium controller hybrid with a heavy-duty liquid dosing pump designed for continuous dosing applications like controlling effluent in a calcium reactor, kalkwasser additions, dosing liquid foods, feeding a sulfur reactor, and performing water changes.

The controller is suitable for both saltwater and freshwater aquariums and can be used independently or in conjunction with other HYDROS devices. The Sole can send alerts and notifications, and when used with a HYDROS XP8 or WiFi Power Strip, it can also control outlets for lights, pumps, feeders, and other aquarium accessories.