RX-C 6D Calcium Reactor

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Discontinued by Bulk Reef Supply
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The Vertex RX-C 6D Calcium Reactor is feature packed and made with very strict attention to detail. From PVC welded seams to epoxy sealed fittings. The RX-C 6D is by far one of the best values when it comes to a calcium reactor.

Premium quality, German engineered calcium reactor from one of the industry's premier manufacturers.



  • Integrated flow meter - Finally, no more guessing flow rates or doing archaic math!  This flow meter gives a precise reading of the effluent flow rate.
  • Bubble counter - High quality, ultra clear bubble counter to ensure correct level of gas input.
  • Gas venting lid - Prevent buildup or excessive pressure of CO2 gas.
  • Resin epoxy sealed John Guest fittings - Hassle free fittings that ensure they will last for years to come.
  • Dual tiered secondary reaction chamber - Secondary reaction chamber for additional media



  • Rated for systems up to 264 gallons, or 120 gallons in an SPS dominant aquarium


Technical Data:

  • Grade II Titanium Screws / Corrosion Resistant
  • Silicone O-Rings
  • Sicce Syncra: 120V, 60Hz , ~ 0.43A
  • Dimensions:  ~ 280 * 310 * 560 mm / ~ 11” * 12” * 22” (Width, Length, Height)** – Unit Only

**Unit can be installed in different fashions to achieve different footprints

More Information
Media Capacity 5 Cups / 1183mL, 6 Cups / 1419mL
Reactor Placement External, In Sump
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Product Questions

How do I find a replacement for the re-circulating pump. It looks like it is just a Sicce 1.5 or 1.0 but it has attachments which are specific for the reactor.
Question by: Cesar Barbosa on Nov 24, 2017, 10:52 AM
The RX-6D does use a Sicce Syncra 1/5 block and impeller, but the volute is a custom Vertex design. You can purchase a new Syncra 1.5 and then just transfer the volute to the new pump. : )
Answer by: Charlie on Nov 24, 2017, 11:18 AM
Has the leak issue mentioned by so many been addressed? What are your thoughts about this issue? Thanks
Question by: Toby Robinson on Nov 16, 2017, 8:53 PM
Owning and operating one of these on my personal tank for the last 2 years, I've been extremely happy with this reactor. On first setting the unit up, I did find a very slight leak at the manifold union on the pump intake. I believe this can easily be attributed to shipping/storage affecting the seal between the cover and pump. It was easily resolved by removing the cover, cleaning and greasing the o-ring, and replacing the cover. I have not had a leak since, and this issue did not require any repair or replacement of any parts.

Hope this helps!
Answer by: Zack on Nov 26, 2017, 9:38 AM
I have space for this reactor in my sump. Can I place this entire unit in my sump into about 10" of water? I can't find any info on the pump being submersible or not. Thank you
Question by: Rick Socarras on Nov 13, 2017, 10:04 PM
The entire unit can be submerged. The pump used is a Sicce Syncra Silent 1.5 which is can be used internally or externally.
Answer by: Charlie on Nov 24, 2017, 1:26 PM
How many pounds of media can this reactor hold?
Question by: Derek on Jun 2, 2016, 5:17 PM
Great question!
This answer will unfortunately vary depending on the type of media used. With calcium reacotrs you will simply fill up the reactor fully and the amount of media will not impact, just how often the media will need to be replaced.
Answer by: Connor on Jun 8, 2016, 2:31 PM
I am having troubles finding quality reactor with small foot print. Can this reactor be used with-out the base which would allow for a different configuration
Question by: neal hillman on Apr 20, 2016, 6:56 AM
Great question!
This reactor can be used without the base to set up in a different configuration. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 26, 2016, 1:32 PM
Does this calcium reactor come with one or more places to install a pH probe?
Question by: Brett on Apr 7, 2016, 7:59 AM
Great question!
This will comes with one probe port. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 7, 2016, 10:45 PM
what is the absolute smallest footprint for this reactor, I am limited in my sump, and only have a 10 inch gap where I could fit this reactor. Would this work?
Question by: Blake on Feb 5, 2016, 8:14 PM
Great question!
Unfortunately the smallest foot print for the reactor is 10.5 x 12.25 Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 2, 2016, 4:37 PM
What is the top chamber for above the secondary chamber.What ph,bubble count and flow rate to start with as a baseline
Question by: Bryan H on Feb 4, 2016, 4:57 AM
Great question!
the secondary chamber is a second compartment to fill with media to catch any remaining lower pH water from entering the aquarium. The pH should be between 6.5 to 6.7 for a proper melting point and often 10 bubble per minute on average. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 4, 2016, 5:11 PM
Does this reactor have to be put in the water or can it run outside of the sump and be fed a line from the the tank. Not a lot of room in the sump.
Question by: Stinnett on Nov 21, 2015, 10:07 AM
Great question!
This can be plumbed either internally or externally no problem! Feel free to let us know if you have any further questions!
Answer by: Connor on Nov 24, 2015, 12:49 PM