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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💧 Stay ahead of impurities with smart color-changing clarity!

INSTANT RESIN STATUS - Color shifts Blue → Yellow → White to signal exhaustion, so you never guess when to replace.
COMPACT LIGHTWEIGHT - Slim 5.08 x 0.64 x 30.48 cm design weighing just 449g fits seamlessly into any filtration setup.
EFFORTLESS INTEGRATION - 1/4 inch tubing with press-fit connections ensures quick, tool-free installation.
CUSTOMIZABLE FILTRATION - Refillable cartridge lets you tailor resin blends to your specific water treatment needs.
ULTRA PURE WATER OUTPUT - Dual cation and anion resins eliminate residual TDS post-membrane filtration for crystal-clear water.

The Aquatic Life DI Color Changing Mixed Bed Resin Cartridge combines cation and anion resins to remove residual total dissolved solids from membrane-filtered water. Its innovative color-changing resin visually signals when the media is exhausted, ensuring timely maintenance. Designed for easy installation with 1/4 inch press-fit tubing and refillable for customizable water treatment, this compact cartridge delivers professional-grade purification in a sleek, lightweight form.

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Brand	AquaticLife
Model Number	330242
Product Dimensions	5.08 x 0.64 x 30.48 cm; 449.06 g
Quantity	1
Laser Class	Color Changing
Are Batteries Included	No
Paint Type	Spray
Item Weight	449 g

Aquatic Life DI Color Changing Mixed Bed Resin Cartridge by Aquatic Life

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