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

Product ID: 260510229

Details

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

🌈Color-changing resin for easy monitoring

🔄21 cubic inch resin capacity

🔧Includes mounting clips for RO Buddie

336.80 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead with water clarity that speaks volumes

PRECISION PURITY CONTROL - Achieve near-zero TDS for crystal-clear water
VISUAL RESIN LIFE INDICATOR - Color-changing cartridge lets you know exactly when to replace
COMPACT TRANSPARENT DESIGN - Clear cartridge for quick resin status checks without guesswork
TRUSTED QUALITY PERFORMANCE - 4.6-star rated with over 1,300 reviews—join the satisfied pros
SEAMLESS RO BUDDIE INTEGRATION - Mounting clips ensure hassle-free installation

The Aquatic Life DI Color Changing Mixed Bed Resin Cartridge offers 21 cubic inches of high-performance resin that changes color to signal exhaustion, ensuring optimal water purity. Designed for easy installation with included mounting clips for RO Buddie systems, this transparent cartridge simplifies maintenance while delivering near-zero TDS water quality. Trusted by thousands with a 4.6-star rating, it’s the smart choice for professionals demanding flawless filtration.

Specifications

ASIN	B00DSP57BQ
Allergen Information	Nut Free
Best Sellers Rank	#57,179 in Kitchen ( See Top 100 in Kitchen ) #207 in Water Filter Cartridges
Brand	Aquatic Life
Brand Name	Aquatic Life
Customer Reviews	4.6 out of 5 stars 1,370 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

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