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, Aquarium, Hydroponics

Aquatic Life DI Color Changing Mixed Bed Resin Cartridge, Aquarium, Hydroponics

Product ID: 4514585

Details

Brand
Aquatic Life
Item Form
Solid
Item Weight
15.84 ounces
Manufacturer
Aquatic Life
Unit Count
1 Count

💧0 TDS ultra-pure water

🔄Color-changing resin indicator

⚙️Tool-free quick inline install

201.63 DT

Duties & taxes included

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Pure water, smart tech, zero hassle—upgrade your aquatic game today!

SMART COLOR ALERT - Innovative resin shifts from blue to tan, giving you a clear, visual cue when it’s time to replace—never guess again.
PLUG PLAY PERFECTION - Effortless inline design with standard ¼” press fittings installs in seconds without tools, saving you time and hassle.
REFILLABLE SUSTAINABLE - Translucent cartridge with removable cap lets you refill resin, reducing waste and keeping your system eco-friendly.
ZERO TDS ZERO COMPROMISE - Delivers perfectly pure water by reducing Total Dissolved Solids to absolute zero, ideal for sensitive aquatic life and hydroponics.
SUBSCRIBE SAVE CONVENIENCE - Never run dry with automatic deliveries tailored to your schedule—plus exclusive savings on every order.

The Aquatic Life DI Color Changing Mixed Bed Resin Cartridge is a direct replacement filter for the RO Buddie +DI system, engineered to reduce Total Dissolved Solids to zero for ultra-pure water. Featuring a color-changing resin that signals exhaustion, it ensures timely maintenance. Its easy inline design with tool-free installation and refillable housing offers convenience and sustainability. Perfect for aquariums and hydroponics, it supports sensitive fish and plants with crystal-clear, mineral-free water. Enroll in Subscribe and Save for hassle-free, cost-effective filter replacements.

Specifications

ASIN	B00DSP57BQ
Allergen Information	Nut Free
Best Sellers Rank	#15,783 in Pet Supplies ( See Top 100 in Pet Supplies ) #155 in Aquarium Filter Accessories
Brand Name	Aquatic Life
Customer Reviews	4.5 4.5 out of 5 stars (1,430)
Global Trade Identification Number	00810957012427
Included Components	Aquatic Life DI Color-Changing Mixed Bed Resin Cartridge for RO Buddie
Item Form	Solid
Item Type Name	Resin Cartridge
Item Weight	15.84 ounces
Manufacturer	Aquatic Life LLC
Manufacturer Part Number	330242
Model Number	330242
Number of Items	1
Pet Type	Fish
Target Species	Fish
UPC	810957016685 810957012427
Unit Count	1 Count
Warranty Description	Manufacturer Warranty

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