• Up to 300 gallons
• Internal Pump, no tubes to cause a loss of flow
• Internal CO2 bubble counter
• Extremely small footprint, 7" base, 21" height

• High dKH value of outflow water
• Minimal CO2 carryover

• Quick and easy adjustment of the CO2 supply
• Small CO2 consumption
• Small CO2 carry-over into tank

• 17"L x 6"W x 20"H
• Up to 400 Gallons
• Holds 16.5lbs of media

KNOP-Calcium Reactors - for stable aquarium conditions KNOP Calcium Reactors increase the carbonate hardness in your aquarium and stabilize the pH value.

Additionally, KNOP Calcium Reactors supply your tank water with calcium and a variety of important elements that are contained in the filling substrate KNOP KORALlith. This is important for the growth of stony corals, giant clams and corallin algae, but also for all soft corals that form calcarous sklerites in their tissue.

• 11"L x 5"W x 19"H
• Up to 200 Gallon
• Holds 3.3lbs of media

KNOP-Calcium Reactors - for stable aquarium conditions KNOP Calcium Reactors increase the carbonate hardness in your aquarium and stabilize the pH value.

Additionally, KNOP Calcium Reactors supply your tank water with calcium and a variety of important elements that are contained in the filling substrate KNOP KORALlith. This is important for the growth of stony corals, giant clams and corallin algae, but also for all soft corals that form calcarous sklerites in their tissue.