AquaMedic CO2 Reactor 1000. **** PRODUCT MANUAL **** The reactor 1000 is a hermetically sealed unit for introducing CO2 into larger aquariums. Its robust mounting plate enables it to be mounted outside the aquarium or inside the cabinet. This powerful unit can supply aquaria up to 2000 l (c. 500 gal) with CO2. Dimensions: overall height 37 cm (c. 15"), diameter: 8 cm (c. 3"). Inlet / Outlet: 1/2"