Super Reef Octopus 5000 Calcium Reactor. Extra large chamber volumes, high performance reverse flow design, superior craftsmanship and a 3 year pump warranty are just a few of the features on the Super Reef Octopus® calcium reactors. If you are concerned about calcium levels due to your calcium loving animals look no further than our SRO calcium reactors. All SRO calcium reactors come with our high water volume Water Blaster pumps which come standard with Silicone Nitiride shafts and bearings, this means no worries of moving parts freezing up causing broken shafts. All SRO calcium reactors come with PH probe holders to monitor PH inside the first chamber of the reactor. We recommend using a pH monitor to watch this level to ensure you do not melt the media to rapidly. Our SRO reactors come in 8″ inch and 10″ diameter chambers which allow for large amounts of media to be used. Specifications:Reverse flow and CO2 Recirculating DesignAuto Fill Bubble CounterProbe Holder w/Plug*Easy to Remove LidPrecision Effluent Control ValveSolid Construction1/4"quick connect fittings3yr Pump WarrantyFootprint: 16.5″ x 11″ | Body Diameter: 9″ | Height: 23″ Recirculation Pump: Water Blaster 5000* Does not include PH probe.