This Active Aqua AACH50 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 132 gallons of fluid at 15 degrees Fahrenheit or 52 gallons at 30 degrees Fahrenheit in 20 hours. It transfers up to 1200 liters of cooled water an hour through your hydroponic system. Use 1/2-inch, 3/4-inch, and 1-inch tubing to connect from an Active Aqua water pump (sold separately). Approved for indoor use only.