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AquaticLife Color Changing Mixed Bed Resin DI Cartridge for RO Buddie Reverse Osmosis System - 21 cu. in.


Item #: AK12427

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This color-changing, mixed-bed resin DI cartridge is an upgrade option for the AquaticLife RO Buddie Revese Osmosis System. With the addition of this filter, you can turn your RO Buddie into an RO/DI system that will produce pure, zero TDS water. Includes refillable DI canister with resin, quick connect fittings, and mounting clips.

  • 21 cubic inch DI resin capacity
  • Cation and Anion resins remove the remaining total dissolved solids (TDS) from membrane-filtered water
  • Cartridge is refillable to allow for easy customization of water treatment
  • Filled with nuclear grade MBD-30 deionization resin which changes color from blue to tan when media is exhausted
  • 1/4" tubing easily attaches to the press-fit connections on each end of the cartridge
  • Includes two clips for mounting to an Aquatic Life RO Buddie.
  • Max working pressure: 35 psi
  • Dimensions: 2 x 2 x 12 inches
  • Weight: 1.15 pounds

Manufacturer information

AquaticLife Aquarium Supplies
AquaticLife is a Southern California based company that innovates, markets & manufactures premium branded aquarium equipment. AquaticLife products and information are designed to bring the experience of marine life into the home. The company manufactures a variety of aquarium products for both freshwater and saltwater applications. Water quality monitors and testing supplies, water filtration and submersible pumps are just a sampling of what this up-and-coming company offers. AquaticLife is best known for their stylish, powerful and extremely user-friendly light fixtures. They are also recognized for their outstanding customer support and helpful educational materials.

4 Stars


Reviewed on
December 05, 2020

No, I would not recommend this.

DI cartridge

Pros: Nothing

Cons: Terrible design

If I could give this less than a 1 I would. How am I supposed to see the color change if it’s in a white tube? The company should use common sense standards when making the product. The instructions clearly say change the cartridge when the resin color changes completely . How am I supposed to see that if it’s in a white tube?

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Reviewed on
October 31, 2017

Yes, I would recommend this.

Works pretty well

Pros: Works well. Color change is clear

Cons: Lid breaks easy (Or I'm just way too strong).

I have no issue with the product's function, as it does what it's supposed to. The only issue I've had was when I replaced the media, I tightened down the cap and it cracked all the way through the top, making it more or less useless. So just be careful with that...

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Reviewed on
May 02, 2017

Yes, I would recommend this.

Great product

Bought as a replacement for my RO buddy

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ralph maher

Reviewed on
December 02, 2015

Yes, I would recommend this.

Aquatic MIxed Bed DI

Have only used this as an adjunct to my RO Buddie System.REsults are fine, easy to know when to be replaced-does what it's supposed to do What more could you want?

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kristopher van duyn

Reviewed on
November 17, 2015

Yes, I would recommend this.

Excellent for small scale use

As for somebody who currently works for a very well known reef store, this RODI unit works very well if your doing small scale tanks. Everything depends on the quality of the water and how slow do you let the water stay in the filtering processes. I tun mine slow so i get the purest of water and it does exhaust the filters quicker. If you need more output i wouldn't use a small scale RODI, but since I'm only running a 30 gallon tank (evaporates a bit less than a gallon a day) it works perfectly. It makes it easy with quick disconnect cartridges. The worst part would be changing the DI resin. There is no need to get a big unit for a small set up like I do!

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brian smith

Reviewed on
February 23, 2015

Yes, I would recommend this.

Excellent resin performance

I'm using this along with the Aquatic Life 50gal/day RO Buddie system and Smart Buddie booster pump. So far I've had the system in place a little over 4 weeks. A typical amount of resin has turned red from processing about 400+ gal of product water thus far. Very pleased overall!

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brian fritzel

Reviewed on
December 10, 2014

Yes, I would recommend this.


The 3 stars are for the job that it does but that's it. I can't get any more than 100 gallons out of each one. I think I'm going to have to upgrade my RO system

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timothy gould

Reviewed on
April 08, 2014

Yes, I would recommend this.

Simple and easy

That's about it: simple (to hook up) and easy (to read [when needs to be changed again]). The RO Buddie overall isn't going to compare to a $400-$500 RO machine, but that's just it: get what You pay for. But I worked at a high quality fish store (saltwater = 70% of the store's market) last Summer/Fall where I first learned of this; then, when I moved out of my own and no longer had my Father's nice Maxxima RO machine from 12-13 years ago, I had to spend within my means, and this fit the bill. Ten months now, and it runs great!! :) Eighty-dollar machine + $40 DI cartridge is worth every penny. Kudos to AquaticLife!

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rick jacomet

Reviewed on
February 07, 2014

Yes, I would recommend this.

DI filter

No need to buy this filter again after the DI resin is used up they sell bags of resin that you can refill the filter with. I got mine from the company that makes the unit for the same price and they said it would be enough to refill the filter 4 or 5 times. It was a bit of a pain to take apart but your saving money so worth the effort. This store sells bags of resin as well. This was the hardest filter to change out of all 4 and even this one wasn't that bad. Over all good RO/DI unit and well worth the money.

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