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

Product ID: 4514585

Details

Brand
Aquatic Life
Color
Blue
Finish Type
Resin
Indoor/Outdoor Usage
Indoor
Item Volume
50 Gallons
Size
1 Count (Pack

💧0 TDS ultra-pure water

🔄color-changing resin indicator

⚙️tool-free inline installation

$58.05

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Description

💧 Pure water perfection, made effortless.

SMART COLOR ALERT - Innovative resin changes from blue to tan, so you never miss the perfect time to replace and maintain peak water quality.
REFILLABLE SUSTAINABLE - Translucent cartridge with removable cap lets you refill with bulk DI resin, cutting waste and saving money.
ZERO TDS ZERO COMPROMISE - Delivers perfectly pure water by reducing Total Dissolved Solids to absolute zero—ideal for sensitive aquatic life.
SUBSCRIBE SAVE CONVENIENCE - Never run dry—automated deliveries keep your system fresh while unlocking exclusive savings.
EFFORTLESS INLINE INTEGRATION - Quick-connect ¼” press fittings make installation seamless—no tools, no hassle, just plug and play.

The Aquatic Life DI Color Changing Mixed Bed Resin Cartridge is a direct replacement for the RO Buddie +DI system, engineered to reduce Total Dissolved Solids to zero for ultra-pure water. Featuring a smart color-changing resin that signals exhaustion, it ensures timely maintenance. Its easy inline design with tool-free press fittings and refillable housing offers convenience and sustainability. Perfect for aquariums and hydroponics, it supports sensitive aquatic life with crystal-clear water quality.

Specifications

ASIN	B00DSP57BQ
Allergen Information	Nut Free
Best Sellers Rank	#24,432 in Pet Supplies ( See Top 100 in Pet Supplies ) #229 in Aquarium Filter Accessories
Brand	Aquatic Life
Brand Name	Aquatic Life
Customer Reviews	4.6 out of 5 stars 1,423 Reviews
Global Trade Identification Number	00810957012427
Included Components	Aquatic Life DI Color-Changing Mixed Bed Resin Cartridge for RO Buddie
Item Form	Liquid
Item Type Name	Resin Cartridge
Item Weight	0.99 Pounds
Manufacturer	Aquatic Life LLC
Manufacturer Part Number	330242
Model Number	330242
UPC	810957016685 810957012427
Unit Count	1 Count
Warranty Description	Manufacturer Warranty

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$58.05

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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