There are 2 sizes of this product on a different website. Can anyone verify if this is the 21 or 31 cubic in. version?

I am unsure what u mean by 21/31 cubic in, I bought this cartilage for my 100 gallon per day aquatic life ro filter and have since put out hundreds of gallons of 0ppm water, it has started changing color but still has long way to go, without the di cartilage the filter puts out 15ppms with the intake water being just under 200ppm

How often do i need to replace this cartridge?

It's refillable. Top cap is removable and replacement resin may be purchased much cheaper than a cartridge. Depends on amount of water passed through it as well as how contaminated it may be.

Will I need to purchase any tubing or any other additional pieces aside from the RO Buddie itself?

Yes you will need extra tubing for the r/o buddie. I just got my r/o buddy a few days ago. Make sure you cut the tubing clean. Otherwise it will leak. first 10 gallons have been 0 ppm. And my saltwater tank looks amazing.

My cartridge does not remotely look green, it's more like a shimmering black, purple, and blue. Anyone else had that problem?

Is it blue when new or it turned blue? Mine is green. I think if it's blue it's used.

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Aquatic Life DI Color Changing Mixed Bed Resin Cartridge

Aquatic Life DI Color Changing Mixed Bed Resin Cartridge

Product ID: 260510229

Details

Brand
Aquatic Life
Item form
Liquid
Item weight
449 g
Number of Packs
1
Unit count
1 Count

👀Clear cartridge for easy resin status check

🔄21-cubic inch resin capacity

🧩Includes mounting clips for RO Buddie

$104.33

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Description

💧 Transform your water, transform your life — clarity you can see, purity you can trust!

INSTANT VISUAL FEEDBACK - Transparent cartridge design lets you monitor resin exhaustion at a glance—never get caught off guard.
PRECISION RESIN CAPACITY - 21 cubic inches of high-performance mixed bed resin ensures ultra-pure water output.
NEAR ZERO TDS PERFORMANCE - Delivers water with Total Dissolved Solids (TDS) close to zero, perfect for pristine aquatic environments.
TRUSTED QUALITY RELIABILITY - Backed by 1,369+ reviews and a 4.6-star rating, this cartridge is a must-have for water filtration pros.
SEAMLESS RO BUDDIE INTEGRATION - Comes with mounting clips for effortless installation and secure fit with your RO Buddie system.

The Aquatic Life DI Color Changing Mixed Bed Resin Cartridge features 21 cubic inches of premium mixed bed resin housed in a clear cartridge for easy resin exhaustion monitoring. Designed specifically for RO Buddie systems, it includes mounting clips for quick installation. With a proven track record of near-zero TDS output and over 1,300 positive reviews, this cartridge guarantees superior water purification for aquatic enthusiasts and professionals alike.

Specifications

ASIN	B00DSP57BQ
Allergen Information	Nut Free
Best Sellers Rank	#117,044 in Kitchen ( See Top 100 in Kitchen ) #419 in Water Filter Cartridges
Brand	Aquatic Life
Brand Name	Aquatic Life
Customer Reviews	4.6 out of 5 stars 1,369 Reviews
Global Trade Identification Number	00810957012427
Included Components	Aquatic Life DI Color-Changing Mixed Bed Resin Cartridge for RO Buddie
Item Form	Granules
Item Type Name	Resin Cartridge
Item Weight	0.99 Pounds
Item form	Granules
Item weight	0.99 Pounds
Manufacturer	Aquatic Life
Manufacturer Part Number	330242
Model Number	330242
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	810957016685 810957012427
Unit Count	1 Count
Unit count	1 Count

Reviews

J**E

Highly recommended

Good quality product

2.08.2022

H**.

Works great

Work very well … TDS almost 0 👌🏻

25.01.2022

L**L

works for Aquatic Life system

works good in my Aquatic Life system

13.07.2026

S**A

Very nice , but costly

Brought 14 tds to ZERO . Nice, but a bit costly

20.07.2020

N**S

It really works!

I'm impressed! It actually reduced TDS from 56 to 2 TDS! Distilled water I bought shows 1. It leaked a bit first time I installed. But I put Teflon tape and is no longer leaking. I know it's not supposed to be used for drinking water, but I have to taste it! Water tasted better than the bottled distilled water. Also water is clearer! Very easy to use, like plug and play, seems durable and I wasn't expecting the unit resin is replaceable. So that is s big plus.. compatible with my ispring, uses 1/4 tubing that plugs in. Comes with brackets.. Pricewise it's not that cheap but it's not that expensive!

14.06.2026

E**S

Works great

Love how easy it was to change.

22.06.2026

S**N

Good product

Perfect filter for Ro Buddie

4.05.2024

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$104.33

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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