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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17
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Description
Caribsea ARM Reactor Media 3.8LCaribsea ARM Reactor Media Caribsea ARM Reactor Media 3. 8L is used as a complete solution for calcium reactors, providing calcium, carbonate, and essential trace elements with high solubility and low phosphate content. CaribSea ARM Extra Coarse Reactor Media contains calcium, carbonate, and trace elements. Nearly 50x the Strontium of other brands (7390ppm) Precision grading allows for maximum carbon dioxide penetration No gastropod shells mean the
Caribsea ARM Reactor Media
Caribsea ARM Reactor Media 3.8L is used as a complete solution for calcium reactors, providing calcium, carbonate, and essential trace elements with high solubility and low phosphate content.
CaribSea ARM Extra Coarse Reactor Media contains calcium, carbonate, and trace elements.
- Nearly 50x the Strontium of other brands (7390ppm)
- Precision grading allows for maximum carbon dioxide penetration
- No gastropod shells mean the lowest phosphate content (less than 1/10th of 1ppm)
- The highest solubility of any reactor media (metastable at 8.2
One of the most trusted media for calcium reactors in the industry. The media is a complete solution that includes both calcium and carbonate as well as essential trace elements.
The media comes in three forms Small, Coarse, and Extra Coarse.
- Small – Provides the most surface area which maximizes the amount of calcium and carbonate that can be added to the tank. *The small size can clog many reactors and may require ongoing maintenance.
- Coarse – larger size granules which are less likely to clog equipment.
- Extra Coarse – Largest size granules and the least likely to clog equipment which results in the lowest maintenance option.
Note: All ARM media is packaged by volume in a 1-gallon container. Weights may vary from container to container.
Size: 3.8L
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 1878 reviews
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Product Reviews
★★★★★ 5
Love denim and tired of cropped jackets?
Fit Type: Oversized, Size: Large, Color: Medium Blue Vintage
I like this a lot, it was what I was looking for as far as I'm so over everything you buy these days is cropped. Cropped styles are great, but are kind of getting old for some things in my opinion. The jacket is big as far as how it fits. I am 5'8" about 180 and I wish I would have got a medium, I got a large.
The large is big and roomy enough that I could even wear ear a thick hoodie under it if I wanted to. However, the length is good as what I was looking for. The upper arms are large. However, this is a great quality denim jacket. Nice and thick, sturdy material (which I wanted).
It's also at a great, competitive low price even if it's not on sale. Don't believe me, go ahead and search jean jackets. You'll see a ton, but I looked too and the quality did not look as good as this and plus the other jackets were a lot more for a lot less. If you're looking for a longer jean jacket, I highly recommend this.
I'd say just think seriously about sizing down 1... even maybe 2 sizes. I would have gotten an XL before I read the other reviews. They recommended to size down, and after getting my jacket I could have sized down to a medium. I'm still happy with it and this is a jacket that is stitched well and will last a very long time.
As always though, that's just my 2 cents. :)
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Reviewed in the United States on January 19, 2026
★★★★★ 4
Nice quality, shape not for me
Fit Type: Oversized, Size: Medium, Color: Medium Blue Vintage
This was just too boxy for my body. Material was nice, quality jean material. Color was true to image. It was a little stiff but as you would expect with nice, new and unwashed denim.
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Solid basic good denim jacket
Fit Type: Regular, Size: X-Large, Color: Authentic Medium Wash
In direct comparison to Levi’s women’s trucker denim jacket, this one is: slightly heavier denim, less stretchy, less fitted. I kept this one and returned the Levi’s because I wanted the roomier fit. I wish it was a little longer in the body: I’m tall, and it isn’t too short but I’d like a little more length. It feels slightly longer than the Levi’s. I wish the sleeves were longer too. They are probably just right for an average height or shorter person. The armholes could be smaller.
The medium wash is a nice medium blue, fairly even in tone. It doesn’t have a lot of stretch but it’s comfortable. The denim is substantial but not too stiff.
Overall, it’s a standard good quality denim jacket without any peculiar style elements or weird cut. It’s good!
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Reviewed in the United States on April 3, 2026
★★★★★ 3
Fabric way to heavy.
Fit Type: Regular, Size: Medium, Color: White
Cute, but material is WAY to heavy, like the heaviest duty denim I've ever seen. Wanted this to be a cute coverup. If you're needing something while breaking broncos or riding your motorcycle would probably be great. I kept it for a while because it was good quality and well made, but it ended up in the donation pile as I'd never wear this.
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Reviewed in the United States on June 10, 2026
★★★★★ 5
Awesome jacket
Fit Type: Regular, Size: Medium, Color: Stone Dark Wash
Love it so not too long or too short but just right and the color is out of sight and fits awesome
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Reviewed in the United States on June 12, 2026
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