The Tunze Calcium Reactor 3171 is used to dissolve calcium granulate to raise the Calcium levels and hardness in a marine aquarium. Requires a CO2 system and calcium media (not included). It's suitable for cabinet systems and aquariums up to 317 gallons with a granulate capacity of 0.4 gallons.

The Calcium Reactor 3171 is self priming, which significantly facilitates its operational start. The water flow rate is adjusted prior to the granulate, and will thus remain very consistent over time. It's equipped with a reabsorption function for the undissolved gases, and therefore consumes very little CO2. Contains a special connector for an internal pH probe.

Features:

• For aquariums up to 317 gallons
• Granulate capacity of 0.4 gallons
• Dimensions: 9.1" X 5.9" X 13.8"
• For external or in cabinet operation
• Cable length: 2.2 meters
• Requires a CO2 system and calcium media (not included)