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Octo CalReact features high-quality cast acrylic body construction; a PH probe holder to allow constant monitoring of water alkalinity (PH Level) with the use of a PH probe (sold separately); a built in bubble counter for CO2 flow rate calculation; reverse water flow for CO2 recirculation to maximise water and CO2 contact time with the coral media which produces CO2. Controllable and variable speed DC pump for energy-efficient and silent operation; Precision effluent control valve; Built-in Bubble counter for monitoring of CO2 drip rate; Probe holder with plug (PH probe not included); High quality handmade solid cast acrylic construction; Removable lid for easy maintenance. Powered by VarioS DC Pump which features a pinwheel impeller; a detachable controller; high quality ceramic shaft and bearing to reduce wear and tear; and the latest variable speed flow technology for refined control; enhanced performance; energy efficiency and safer operations. Suitable for Tank Volume: 400-800L