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Calcium Reactors & Kalkreactors
A calcium reactor is a simple, convenient solution used to maintain calcium and alkalinity in a reef aquarium. They require little maintenance after the initial setup and are almost a necessity for tanks heavily stocked with stony corals, where calcium and alkalinity demands are high.

To remove any guesswork, we’ve assembled several packages that include everything you’ll need: a calcium reactor, a CO2 Regulator with a needle valve, media, and a CO2 Tank. The Aqua Lifter pump is a very useful—and very affordable—accessory that will feed your calcium reactor with water (although this is not necessary for general operation).

Calcium reactor lines favored by Marine Depot customers include Korallin, KNOP, AquaC RX-1 and Precision Marine.
Calcium Reactor
AquaC RX-1 Calcium Reactor
The AquaC RX-1 represents the pinnacle in calcium reactor technology. AquaC has taken great care in combining all the features an advanced reef hobbyist would look for in a calcium reactor and put them into a compact unit that is easy-to-use and maintain.
Coralife Calcium Reactors
Coralife calcium reactors are constructed of high-grade acrylic and feature a 3” diameter, “easy-twist” reactor chamber. Included are a pH probe/sensor inlet fitting, an integrated see-through CO2 bubble counter and CO2 check valve.
Deltec Calcium Reactors

Media is kept constantly moving, so that it is impossible for channeling to occur and the whole of the media is utilized. Can achieve a dKh in excess of 80, which corresponds to a significantly higher calcium level.
KNOP Calcium Reactors
KNOP produces three calcium reactors models, each of the highest quality and remarkably easy to setup. They offer the stability of calcium, kH and strontium for maximum growth of all corals, especially stony corals and clams.
Korallin Calcium Reactors
Our top-selling, highest-rated Calcium Reactor. Superior quality. The lowest CO2 consumption of any reactor, meaning less impact on lowering the pH of your aquarium.
Precision Marine Calcium Reactor
High quality reactor with a compact design. Simple adjustments to make its use as simple as possible.
Precision Marine Effluent Chamber
Attaches to any calcium reactor to help raise the pH of the effluent from your reactor.
Replacement Eheim Pump
German made, top of the line internal or external water pump.
Tunze Calcium Automat Reactor
Combines high efficiency and a compact size, consisting of a reactor with pump and the Comline housing. No additional supply pump and is operational with minimum water level.
ViaAqua Acro-Cal Calcium Reactor
Offers a simple and convenient solution for maintaining calcium and alkalinity in your reef tank.
Kalkreactor
Deltec Kalkwasser Stirrers
Ideal for supplying the marine aquarium with saturated Kalkwasser. When connecting the Deltec Kalkwasser stirrer to an automatic water level top-up system, the supply of Kalkwasser to the aquarium is automatic.
Precision Marine Kalkreactor
Master fabricated and computer cut, the KR620 is a very nice piece of equipment. One of the best ways to add kalkwasser to your aquarium. No additional supply pump, and is operational with minimum water level.
Calcium Reactor and Kalkreactor Media
CaribSea Calcium Reactor Media
A complete reactor media containing not only calcium and carbonate, but essential trace elements as well.
Elos Calcium Reactor Media
Calcium Carbonate and Hydroxide Reactor Media.
D-D ROWA Reactor Media
ROWAlith C+ is recommended for Deltec Fluidised Calcium reactors and is 50:50 blend of Rowalith C and Rowalith W. ROWAkalk supplies calcium to build reef aquarium inhabitants their skeletons and shells.
KNOP KORALlith Calcium Reactor Media (Calcium Carbonate) & ReefBase
KNOP KORALlith is a natural and phosphate-free calcium granulate that originates from fossilized marine habitats. KNOP ReefBase is a natural and phosphate-free calcium granulate that originates from fossilized marine habitats.
Korallin Natural CaCO3 Media
It is the most ideal natural substrate for all saltwater aquariums. It consists of dead coral skeletons that are broken and crushed by the action of the ocean waves.
 
 
 
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Hydor Koralia Powerheads, Controllable Powerheads & Wavemaker