Hydros SoleThe HYDROS Sole is an aquarium controller hybrid with a heavy duty liquid dosing pump designed for continuous dosing tasks in saltwater and freshwater aquariums. It can be used independently or with other HYDROS devices. Controller Designed for Continuous Duty Liquid Dosing Applications 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