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SeaBones Calcium Reactor v2
SeaBones Calcium Reactor v2
SeaBones Calcium Reactor v2

SeaBones Calcium Reactor v2

5 reviews
$ 469.99 $ 328.99

30% off sale will only last until first 100 units sold.  Current lead time is approximately 3 weeks.

Balanced replenishment of calcium and alkalinity is among the most important water quality corrections required for a thriving reef aquarium.  The SeaBones calcium reactor achieves this by liberating calcium and bicarbonate ions from aragonite media, typically old coral skeletons, using CO2 gas.  This process yields equal amounts of calcium and alkalinity added to your aquarium water with no by-product ions, unlike with two-part A/B solutions, which can throw off your system's ionic balance.

Once the reactor is installed and set to meet the calcium and alkalinity demands of your aquarium, it is a very hands-off system for continuous addition of these needed elements.  Since it operates continuously, calcium and alkalinity are added at exactly the rate they are taken up, resulting in very stable water chemistry parameters.  This is essential for the health of sensitive corals like Acropora sp. (SPS, aka Stability Promotes Success).  Again, this is unlike two-part solutions, which are often added all at once, causing a spike in calcium and alkalinity levels on a daily basis.

Back by popular demand (and some of you have been asking for a long time), our new version 2 SeaBones reactor takes advantage of the efficient design we developed for our Mutiny Ozone reactor, using a low power draw Sicce syncra pump to quietly and rapidly recycle seawater through a carbon dioxide internal atmosphere.  The coral bones media effectively acts as a diffusion chamber, creating a large surface area for CO2 to dissolve into seawater and react with the media.

Keeping the system simple, we selected a very tiny and energy efficient 12v DC feed pump, and matching drip nozzle that automatically sets the flow through rate at an ideal and consistent level.  This small pump is still capable of building significant internal reactor pressure, useful for helping dissolve CO2 into seawater.

Technical Data

Footprint with connected optional secondary media chamber: 12" x 7" x 21" tall.  Without the secondary chamber, the footprint is 7" x 7".

The secondary reactor chamber can be placed remotely for more flexible footprint options.

What's Included

Comes with main reactor, recirculating pump, feed pump, drip nozzle for flow control, and CO2 check valve.  The secondary chamber pictured with the main reactor is optional.

4 feet of tubing for reactor hook up are included, all CO2 safe tubing for water connections is included.

What's needed

A CO2 cylinder and regulator with bubble counter are required for operation but must be purchased separately.  We recommend the Aquarium Plants' Carbon Doser CO2 regulator.

We recommend chunky "coral bones" style calcium reactor media, such as Two Little Fishies' Reborn media.

Installation Guide


Customer Reviews
5 Based on 5 Reviews
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Christopher E.
United States
Calcium reactor

Very good construction however I did have a re glue the base other than that it’s was solid

Steven .
United States United States
Loving this!

This thing comes out of the box looking amazing. It was very easy to set up. I had 2 issues trying to get it set up. The first is that I found silicone O-ring grease to be necessary to prevent CO2 from leaking. Not a big deal. The other problem I ran into was completely self inflicted. In my frustration of not getting the leaks stopped prior to getting the grease, I put the unit back together and flooded it with CO2 to drive pH down immediately. Of course, this raised pressure enough that it displaced enough grease to cause a new leak. Cleaned and re-greased the o-ring, put it back together, set the CO2 to around 1 drip a second and walked away. Rock solid after about an hour. My sump is a little loud, but this didn't add any noise that can be heard. That might change as the media level in the reactor lowers but for now it is very quiet. I was going to put it in my sump but it looks to nice! It's under my stand for now, but I plan on moving it out where it can be seen. It looks great and I love explaining how my system works so I want it easily visible.

Michael C.
United States United States
Quality calcium reactor

Been run for a few weeks now and has been rock solid. Nice steady drip rate and is very quiet. Its keeping up with the demand of my 225 gallon sps dominate mix reef with a few large colonies. I did add a bubble counter to it because I run a dual stage regulator and like to see the bubble speed.

Travis W.
United States United States
Quality Construction

Item arrived quickly and was safely packaged. Very easy to setup using the online instruction guide. When I had questions support answered the same evening through Facebook. The build quality is outstanding. Will update this review once I get the reactor tuned properly but appears to have been a great purchasing decision.

Michael K.
United States United States
Amazing quality

The quality of my calcium Reactor is top notch. Would recommend.