Medium CO2 Scrubber (2.2lb Capacity)

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Take control of your aquarium’s pH with an IceCap CO2 Scrubber

If you’re struggling to maintain pH or if your aquarium suffers from chronically low pH despite your alkalinity being spot-on, connecting an IceCap CO2 scrubber to the air intake of your protein skimmer is a great way to raise and keep your pH level within the ideal range. The addition of a CO2 scrubber can deliver quick and often dramatic results, raising the pH in your aquarium through the reduction of excess dissolved carbon dioxide. This in turn can have very visible results through improved coral growth and overall health.


The pH in a reef tank should be around 8.3 for optimal coral growth. Having low pH results in slower coral growth, so by boosting it with the IceCap CO2 scrubber, you’ll be able to achieve faster growth and experience fewer pH swings. With your pH level stable, coral growth and nutrient uptake will increase. Calcium and magnesium consumption are also likely to increase as you raise the pH level, so be sure to continue testing your major water parameters along the way to ensure your reef flourishes.


Recommended Use

The IceCap CO2 Scrubber can be installed on just about any aquarium with a protein skimmer. Just connect the tubing from the air intake of your protein skimmer to the output side of the CO2 scrubber. You may be able to remove the silencer from your protein skimmer. Next, remove the lid of the scrubber and fill the reactor with the CO2 absorbing media of your choice and place it back inside the scrubber.


Finally, put the lid back on the scrubber and tighten it. Test the pH level of your aquarium water hourly (or as frequently as possible) during the first few days of use. An aquarium controller such as the Neptune Apex or other pH monitor with a pH probe is the ideal way to track your pH.


Once the pH level begins to drop (usually after 2-4 weeks), it’s time to replace the media inside. Most carbon dioxide removal media changes colors once it’s depleted, so you’ll likely have a visual indicator as well to help you determine when it’s time to swap it out, but pH will be the true deciding factor.



  • Dimensions: 4.5”L x 4.5"W x 9.5 "H
  • Media Capacity : 2.2lbs (1kg)
  • Connections : 3/8" Push-Connect Fittings



What’s Included?

  • IceCap Med. CO2 Scrubber (2.2lb Capacity) w/Built-In hanging-bracket
  • 1kg IceCap Color-Changing CO2 Absorbent Media
More Information
UPC 6972809520857
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Product Questions

Is the center opening the air intake or output to protein skimmer?
Question by: Michael Kurolvech on Jul 12, 2023, 6:53 PM
Hey there,
Thank you for reaching out to us. The center is the Air Intake.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Jul 27, 2023, 9:32 AM
Can I install this right out side the box on a reef octopus regal 150 int or do I need a different tube to fit on the skimmer
Question by: Michael Youssef on Sep 5, 2022, 11:24 PM
Hey there,
Thank you for reaching out to us. This will be able to install right out of the box on that skimmer.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Sep 9, 2022, 8:01 AM
I have a nyos 120 and I bought this ice cap co2 scrubber in a medium and I can't figure out how 3/8 vinyl tubing connects to the venturi it's clearly not the same size what I'm I missing here . Can someone please help me understand this
Question by: ENRIQUE JUSTINIANO on Jan 19, 2022, 6:36 AM
Hey There, thank you for reaching out to us! The tubing on the Nyos Skimmers is 3/16" tubing. You can utilize the https://www.bulkreefsupply.com/ozone-resistant-reducing-barb-union-1-4-x-3-16.html and secure it with a ziptie or melt the tubing into place.
Answer by: James Johnson (BRS Staff) on Jan 21, 2022, 3:44 PM