Hydrofarm Active Aqua AACH50 Chiller, 1/2 hp Large refrigeration capacity (recommended volume 52-132 gal/200-500 L) Anti-corrosive pure titanium evaporator for both fresh and salt water Rate of flow: 1/4 HP (350850 GPH/1320-3220 L/hour);Recommended pumps: AAPW550 or AAPW800 Tubing size: 1/2" (HGTB50), 3/4" (HGTB75), 1" (HGTB100);Unit Dimensions: 18.7"L x 14.1"W x 19.3"H For cooling capability, please refer to the performance chart found in the product information tab.