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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描述

💧 Stay ahead of impurities with color-smart purification!

PREMIUM RESIN BLEND - MBD-30 resin mix delivers superior ion exchange for crystal-clear water
INSTANT VISUAL FEEDBACK - Color-changing resin signals resin life and purity status at a glance
COMPACT DURABLE DESIGN - Slim 5.08 x 0.64 x 30.48 cm cartridge fits neatly and withstands indoor use
HIGH CAPACITY FILTRATION - Purifies up to 50 gallons, ensuring long-lasting, reliable water treatment
SEAMLESS RO UNIT INTEGRATION - Designed specifically for Aquatic Life RO Buddie systems for perfect compatibility

The Aquatic Life DI Color Changing Mixed Bed Resin Cartridge is a high-performance water filtration accessory designed for Aquatic Life RO Buddie units. Featuring a premium MBD-30 resin blend, it purifies up to 50 gallons of water while providing instant visual status updates through its innovative color-changing technology. Compact, durable, and proudly made in the USA, this cartridge ensures your water treatment system runs efficiently and hassle-free.

规格

Brand	Aquatic Life
Colour	Light Grey
Finish Type	Resin
Size	1 count (Pack of 1)
Item Volume	50 Gallons
Special Feature	Color Changing
Net Quantity	1.0 count
Paint Type	Resin
Specific Uses For Product	Water Treatment Systems
Indoor/Outdoor Usage	Indoor
Item Form	Liquid
Included Components	Bulb
Is Waterproof	True
Package Information	Cartridge
Colour Code	#9298A4
Coverage	Medium
UPC	810957016685 810957012427
Global Trade Identification Number	00810957012427
Manufacturer	Aquatic Life LLC
Country of Origin	USA
Item model number	330242
Product Dimensions	5.08 x 0.64 x 30.48 cm; 449.06 g
ASIN	B00DSP57BQ