Rated 5.00 out of 5 based on 1 customer rating
(1 customer review)


The CR612 calcium reactor will hold 8 pounds of large grain media and is well suited for reef aquariums up to 200 gallons.

SKU: CR612 Category: Tags: , , , Product ID: 1731



  • 6″ diameter reaction chamber
  • All cell cast acrylic construction
  • Key hole slot for lid removal
  • Full access to the reaction chamber
  • Micro ball valve effluent control comes connected to tubing harness
  • Sicce Syncra 1.5 pump, bolted to base plate
  • pH probe port in lid
  • pH probe adapter included
  • Auto fill bubble counter
  • 11 x 10 foot print, 16″ overall height
  • Comes with tubing harness shown in picture
  • All tubing fittings are 1/4″ OD push to connect

Additional information

Check Valve

None, Add High Grade Check Valve for 19.99

Precision Needle Valve

None, Add Precision Needle Valve for 25.99

1 review for GEO CR612 Calcium Reactor

  1. Rated 5 out of 5

    David Bourassa (verified owner)

    This is, by far, the most beautiful reactor I have seen or utilized in this hobby. Every detail is sleek, modern and well thought out. I have and love an older 612 model and I was not sure how I would like the new white version in person but once unpacking I instantly fell in love. The pump plate, black silicone and color coded tubing are just a few highlights that you don’t see in other reactors. The uniseal vs older threaded elbow is a plus and even the etched GEO is etched in this reactors lid stand out in a top shelf kind of way. There is only one name in the game for Calcium Reactors and thats GEO hands down. I’m as stoked to show this off as I am colonies of Acros. Now I am looking at the rest of their range to see what will be under my stand. Fantastic job GEO.

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