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


The CR624 will hold 16 pounds of large grain media and is a reactor well suited for large SPS reef aquariums from 200 to 400 gallons.


SKU: CR624 Category: Tags: , , , Product ID: 1741



  • 6″ diameter reaction chamber
  • All cell cast acrylic construction
  •  3/8″ thick lid, flange and base
  • Key hole slot for lid removal
  • Full access to the reaction chamber (union tops do not provide this, making maintenance a chore)
  • Now comes with inline Precision Needle Valve for fine tuning
  • Sicce Syncra 3.0 bolts to base plate
  • pH probe port in lid
  • pH probe adapter included
  • Auto fill bubble counter
  • Approximately 11.5″ x 12″ foot print, 29″ overall height
  • Comes with tubing harness shown in picture
  • Comes with all push to connect fittings

Additional information

Additional Accessories

None, Add high grade check valve for $19.99

1 review for GEO CR624 Calcium Reactor

  1. Rated 5 out of 5

    Warren (verified owner)

    Received my reactor. It is very well built, and they were very accommodating to an additional request, which was to add a dedicated port to the lid for effluent. Makes it easier to prevent an air pocket, as I plan to use mine with a Watson Marlow pump. All of the parts are well built, and there’s more than enough tubing to get everything connected. I have 2 very minor suggestions to make this top notch product a little better. One is to not use stickers on the pump mount indicating the input union is glued in. It doesn’t come off cleanly, and the other is to include a union near the top of the recirculation pipe, or change the recirculation pipe to flex pvc, so that you can open the top without loosening the union at the pump.

    • admin

      Thank you for your support and suggestions. We took care of the sticker issue and relocated it to the plastic wrap the pump is covered in. Issue fixed! We are playing around with the idea of silicone tubing on the output of the pump to take care of the other. Thanks again for your purchase.

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