RX-C 6D Calcium Reactor - Vertex

Vertex RX-C 6D Calcium Reactor
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  • Vertex RX-C 6D Calcium Reactor
  • Vertex RX-C 6D Calcium Reactor Parts
  • Vertex RX-C 6D Calcium Reactor Pump
  • Vertex RX-C 6D Calcium Reactor Bubble Plates
  • Vertex RX-C 6D Calcium Reactor Back View
  • Vertex RX-C 6D Calcium Reactor Gauge

RX-C 6D Calcium Reactor - Vertex

46% Recommend this to a friend (6 of 13)

SKU: 208825
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Quick Overview

Why does BRS recommend this?

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.


  • Integrated flow meter

  • Bubble counter

  • Gas venting lid

  • Resin epoxy sealed John Guest fittings

  • Dual tiered secondary reaction chamber

  • Utilizes 1/4" Push Connect Fittings


Ask a question

Product Questions

How many pounds of media can this reactor hold?
Question by: Derek on Jun 2, 2016 5:17:00 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 (Admin) on Jun 8, 2016 2:31:00 PM
What feed pump do people recommend for this reactor
Question by: Bryan H on Jan 27, 2016 4:43:00 AM
Great question!
many people use with Sicce 1.0 as a fee pump with a Kynar adapter to reduce the output to the correct size. I have included the links below!

1⁄2” Male NPT x 1⁄4” Barb Kynar Straight
Answer by: Connor (Admin) on Feb 3, 2016 5:14:00 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 10:07:00 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 (Admin) on Nov 24, 2015 12:49:00 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 6:56:00 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 (Admin) on Apr 26, 2016 1:32:00 PM
Does this calcium reactor come with one or more places to install a pH probe?
Question by: Brett on Apr 7, 2016 7:59:00 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 (Admin) on Apr 7, 2016 10:45:00 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 4:57:00 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 (Admin) on Feb 4, 2016 5:11:00 PM
This isn't a great question! The adapter mentioned in an earlier answer on this isn't correct page. Bad answer!
Question by: Al Pidgen on Jun 25, 2016 4:27:00 PM
Thanks for pointing that out. In order to adapt a Sicce 1.0 you can use the 2 items below to attach to the 1/4" tubing of the reactor. First will reduce the threads from the pump down to 1/4" and the second will attach a quick connect fitting to plug in the 1/4" tubing to.

Schedule 80 Reducing Bushing 1⁄2” Thread x 1⁄4” Thread
SKU: 202595

1⁄4" Male NPT x 1⁄4" Push Connect
SKU: 200500
Answer by: Connor (Admin) on Jul 1, 2016 9:59:00 AM
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 8:14:00 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 (Admin) on Mar 2, 2016 4:37:00 PM

Full Details

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



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  • Where have you been all of my reefing life! By Buddy B on 8/16/2017

    Love this Ca reactor. I've tried others but this one takes the cake. Great build quality and all the features you can think of. The needle valve is awesome, bubble counter too. secondary chamber works well
  • Leak Leak By Hien on 6/4/2017

    I have two of these! both are leak at the pump and flow meter on both of them are not working. If I could return these, I would.
  • Great reactor, Crappy Pump By vgc on 1/8/2017

    My aquamaxx reactor had same issue with this same pump design, I have emailed back in forth with the sicce pump leaking, still no resolution, enough salt leaked out that leak has stopped until I break the seal again I know its going to leak, for HEAVAN sake listen to users and GET RID of the sicce pump!!!
  • Leaks near pump connection By Shane on 1/4/2017

    Everything about this reactor is superiorly engineered..... except for one major design flaw where the sicce connects to the CO2 chamber. The pump intake seal is not sufficient and is fix mounted to the connectors. I've had the reactor for over a year now and found it very easy to setup and tune. It has otherwise run like a champ. It leaked at the intake of the pump in the beginning for a bit but I was finally able to twist and turn it just right so that ithe leak creeped over and stopped. I took it apart tonight for annual cleaning and it wouldn't stop leaking no matter what. I finally just siliconed the whole thing and hopefully tomorrow no more leaks.
  • major design flaw By Mike P on 1/3/2017

    agree with Aretus Jr. the side of the CO2 interface that connects to the Sicce pump twists on and off.
    one of the grey tabs broke off. have to replace the entire CO2 interface chamber. reactor inoperable until part comes in.
  • Leaks... By Tony on 12/31/2016

    I had this reactor for over a year and it leaked in multiple places from day 1. I had to install it in sump so that the leaks would just go into the sump. Eventually, I threw it away and got a different brand calcium reactor for out of sump installation. The new reactor is leak free.
  • This Reactor has Leaked from the Pump a year now. By AretusJr on 12/3/2016

    I bought this reactor Black Friday 2015. Everything about this reactor is good minus one major flaw.
    I love the dual chambers and the recirculation of co2 gasses.
    However, My reactor has leaked from the pump because it does not screw on, the pump and the gas exchange chamber connects but sliding around the pumps notches the pump to main chamber screws on tightly why didn't Vertex do the same on both sides.
    I contacted Vertex and I have been waiting for the parts to come in to replace the locking mechanism for about 5 months now.
    I notice it after I removed from the sump and I'm still waiting for the part to come in.
  • Solid acrylic construction, subpar flow meter By Oswaldo G on 10/23/2016

    I've had the reactor for over a year now, since set up it ran well and had no issues with it, aside from issues with the flow meter. I only drip the effluent therefore the meter does not offer a measurable flow. Just recently I've noticed that the rod in the flow meter has rusted. It's disappointing because the product is meant to be used with saltwater, yet the material used in the flow meter is not corrosion resistant.
  • Good CalRx and all but Flowmeter is not working By Hien on 4/2/2016

    Good quality CalRx and all. Flow meter was what my intension toward this one but it turns out that flow indication is never even close to what the actual flow rate is.
  • This thing is well built By ED on 3/20/2016

    Easy to use and built like a tank. Set up is easy and works fantastic with a ph controller.
  • best reactor yet By Thomas on 12/18/2015

    This is one of the best calcium reactors that i have ever worked with. I run a large coral farm and when it comes to my home tank i wanted something that was just a plug and play. this reactor is very well made. you can really tell when you pick it up. another thing i would like to point out is how easy this thing was to set up. it is a great product and even looks awesome under my stand.
  • Most efficient reactor I've seen By Brian on 6/7/2015

    I have had this reactor up and running for nearly a month now. I have held off on any reviews as I wanted to get a good gauge of how this operates. I would like to provide my full review of this as I, just like many, was overwhelmed with the number of options for calcium reactors. The cliff notes version of my review is; this is well worth the money, it is efficient, simple to use/setup, with all the bells and whistles. This has been the most efficient reactor I have seen and the solenoid rarely kicks on as it is recirculating much more of the CO2 than my prior reactor.

    I ran a reef octopus skimmer prior to this purchase. I had done research and read reviews for weeks. Main reasons for my choosing this reactor (also main reasons I wanted to switch to a new reactor) are as follows:
    1. Self purging
    2. Built in flow meter
    3. Solid construction
    4. Dual Chamber

    Now to elaborate to each of these points. My old reactor was having issues where CO2 was being trapped consistently. It became an almost weekly chore to purge the chamber. I read that the Vertex was self-purging and although was skeptical of this, this was main reason I purchased this. After a short assembly (less than 30mins) the reactor was running. Once CO2 started running into the dual chambers, there was gurgling, as expected. I was patient and by next morning when I checked on this, there were no further signs of trapped air. Even times when doing maintenance on tank and restarting the reactor, CO2 is now quickly purged from chamber. No more noise!
    Second most important feature that lured me to purchase this was the built in flow meter. I had been adjusting with a two little fishies flow meter but could never seem to get it right. The flow meter on the Vertex is made well and works perfectly. Once set, this doesn't change, even with maintenance to tank the flow remains constant. This in effect has help my levels remain more stable than I have ever experienced with dosing or the old reef octopus reactor.
    The construction of this is very solid acrylic with locking tops. Old reactor and many other on market require screws to hold the lid in place (old reactor screws kept breaking). The dual chambers allow for more media and holds a surprising amount.
    There is an additional chamber the helps with recirculating the CO2 throughout. This has made a significant impact on how my reactor is being used. No longer is regulator on all the time as it was with my old reactor. I rarely ever see it on now, meaning no wasting of CO2. This made me nervous my first couple weeks with it thinking it was not working, but levels are all steady and consistent.

    I would have no hesitation recommending this to anyone. Not only does it work flawlessly, it is an impressive piece of hardware for a reef system.