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Korallin C3002 Calcium Reactor with Eheim Pump

Korallin C3002 Calcium Reactor with Eheim Pump


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Item #: KL3002

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The already best-selling Kalkreaktor (Calcium Reactor) in Germany has become even better. It completely replaces Kalkwasser, 1 or 2-part Calcium/Buffer powder & liquid dosing. The new and improved Korallin kalkreaktor allows a simple, elegant and high efficiency production of calcium hydrogen carbonate including the necessary balanced carbonic acid. Sit back and watch your aquarium`s pH and dKH being kept at optimum levels. Together with our reliable CO2 System, this is the most maintenance-free Kalkreaktor setup in the world.
Ca2+ + 2HCO3 = Ca(HCO3)2 = CaCO3 + H2CO3 Calcium + Hydrogen Carbonate =
Calcium Hydrogen Carbonate = Calcium Carbonate + Carbonic Acid
A Kalkreaktor setup (ie: one with CO2 System and CaCO3 media) is expensive only at the beginning. You save money in the long term because a 5-pound CO2 refill lasts you 1.5 years on our Kalkreaktor (and only ours) while a 7-kg CaCO3 media lasts you up to 1 year! And no more tedious daily Calcium dosing. A pH Controller is not required for our Kalkreaktor because there is no chance for the excessive CO2 to escape into your system like ALL other brands on the market. A pH Monitor is a nice equipment to have for fast pH measuring. Though pH Test Kit and pH Pen-monitor can still be used for this purpose.

The internal recirculation flow rate of the C-1502 is around 80 g/h. Since that this is a pressurized Kalkreaktor, the dissolution of the media by the carbonized water is enhanced. The effluent rate is only about 0.25 g/h at 40 drops/min. Thus explaining the efficient CO2 & media use. CO2 is being introduced into the Eheim powerhead direct—this is the most efficient Aspirating-Venturi method.

  • Top-loading & access w/ enhanced O-ring seal
  • `Auto-fill` Integrated Bubble Counter on one water circuit (ie: water never evaporates)
  • Detachable Tru-Union couplings w/ O-rings for easy handling, safe shipping, upgrading and leak proof
  • Integrated `industrial-grade` Brass Check Valve from German Air Pressure Systems to prevent back flow of pressurized saltwater
  • Improved engineering for stronger water circulation and suction
  • Secure German airline tubing connectors
  • Medical-use Miniature Quick Disconnect Couplings w/ shut-off 3 Inlet & outlet facing same direction
  • Special elbow for flexible airline tubing mounting
  • Heavy-duty Excelon construction w/ no unsightly and fragile hangover tubing
  • Top pump-mounting design
  • Self-suction water intake by the silent Eheim pump eliminates the use of a dedicated powerhead, gravity-fed or tee-off methods. It also serves for water recirculation.
  • Water circuit interruption in case of CO2 overdose—our exclusive CO2 Safety Feature
  • Visual excessive CO2 check w/ ventilation valve for quick release
  • Dual effluent outlets to suit different systems
  • Aspirating-Venturi technology utilizes only 10 CO2 bubbles/min. and up—most efficient use of both CO2 gas and CaCO3 media
  • The most compact and versatile positioning Kalkreaktor in its class—6.25" small foot print + 15.75" total height—external or in-sump
  • Micro-adjustable miniature ball valve to maintain a consistent effluent drip rate
  • Slightly larger (German size) airline tubing for more consistent water flow
  • Strainer to protect Eheim pump from loose media particles

Manufacturer information

Korallin is a German based company who is a manufacturer of specialized aquatic components and accessories for the advanced marine aquarist.

5 Stars


Reviewed on
September 30, 2013

Yes, I would recommend this.

Great product

Setup was easy. Looking forward to the results.

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eric butler

Reviewed on
April 06, 2013

Yes, I would recommend this.


works as it should. was pretty easy to put together. had it running in about 45 mins. calc levels went up quikly.

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felix medina

Reviewed on
December 17, 2011

Yes, I would recommend this.


I like this product, would recommended to a friend. As soon as i received the item, i installed it right away. real easy to use, i have a 125g aquarium and i got the c1500 right size for my tank as per a feed back that was recommended.

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kensley williams

Reviewed on
July 03, 2010

Yes, I would recommend this.

Well made

I love it up and running in about an hour

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Reviewed on
January 20, 2009

Yes, I would recommend this.


I have a 180 gallon reef. I upgraded from a 75 gallon reef and kept my C-1502. It turned out to be too small, so I got the C-3002 here and it's the perfect size for a 180. They say it goes up to 800 gallons, I say more like 300 gallons, maybe 400 gallons on a tank with low SPS.

Was this review helpful? 9 0

aaron schapper

Reviewed on
April 27, 2008

Yes, I would recommend this.

Quality Product

Easy to set up and run. With the PH meter top it was even easier! I had it tuned and running in about 30 minutes. Very good product with quality parts. It was about twice the price of the last reactor I had, but well worth the money.

Was this review helpful? 4 0

daniel riek

Reviewed on
November 30, 2007

Yes, I would recommend this.

Korallin Reactor 3002 Pkg 2

After receiving the package I inspected all the parts and found that the pump was missing the entry and exit attachments. I had to wait another week before I could hook it up. I have to give you extra points for helping me with this. When I called them they gave me two options: 1. Return/replace the pump 2. Have Eheim send me the parts. I decided to have Eheim send me the parts. Your customer service rep took care of everything and even followed up. More on the parts: The CO2 tank is excellent! as well as the regulator. As far as the Korallin Reactor: very quiet except for when a bubble goes through the pump about every 6secs, even then it is relatively quiet. I have it next to my TV and it does not interfere with the TV sound. Putting the unit together: the instructions need more and better pictures. Their web site(Korallin) is no help for sales info or pictures. I got my sales info from reviews I found online(Google, MarineDepot). The unit was easy to put together, but I had to read the instructions several times to fully understand what was needed. Running the Unit: getting the bubble counter to get to 6 bubbles a minute takes time to get dialed in. There are two pressures that have to be adjusted, 1. Tank 2. Regulated. Each one has to be adjusted. Since the reactor only uses 6 bubbles a min, when you change any setting on the regulator it takes time to see the adjustments on the Tank pressure or the bubble counter. Example: adjust one knob(ever so slightly) wait several minute to see the reaction. Once dialed in the unit has been functioning good. WARNING!! if you have kids these knobs will get adjusted by them. My boys think it is funny to watch Daddy run from across the room. There are two water exits on the unit, they supplied values to get the water bubble count right. These are horrible, use something else. Also it should be stressed that you use a pump to feed the unit. I am using the aqua lifter pump.

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ron jackson

Reviewed on
September 20, 2007

Yes, I would recommend this.


Great little product, nicely constructed, easy to dial correct mix. Instructions could use a few more pictures. Product did not mention I would need an extra micro pump. Overall worth the $

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