This Active Aqua AACH100 hydroponic chiller and refrigeration unit is perfect for keeping the water and nutrient solution in your reservoir at an optimum temperature level. This easy-to-use chiller features a microcomputer control system and LCD display. Freon free, it's environmentally friendly and capable of chilling approximately 80 to 700 gallons of fluid at any degree above 39 Fahrenheit. It transfers up to 1,200 liters of cooled water an hour through your hydroponic system. Use 1-inch tubing to connect from an Active Aqua water pump (sold separately). Approved for indoor use only.