Is this stuff the same as pumice?

As Matthew M suggested, I looked at the data sheet. 100% pumice by weight. The data sheet gives a Chemical Abstracts Service number (CAS#) for it, and that is 1332-09-8. Google that number.

do you need to keep this in a bag or in the tray in my cascade canister filter?

It can be placed in your tray. it is loose. Might want to make sure you use a tray for the canister that has the lid on it.

Does it work the same way as the ceramic bio rings?

A million times better. The ceramic rings are trash. This has a lot more surface area because of the small cavaties in each piece. This stuff is fantastic for your bacteria.

I have a Magnum 350 filter which has a canister that has charcoal on the inside and a foam sleeve outside. Do I use this to replace the charcoal?

No, charcoal is a chemical filter. Matrix is a biological filter.If you did not need chemical filtering in your system, you could repurpose the Magnum 350 as a bio-filter by replacing the carbon with Matrix. This would help control ammonia/nitrites/nitrates at the expense of controlling organic pollutants.

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Seachem Matrix Bio Media 1 Liter

Product ID: 2271706

Details

Brand
Seachem
Item Form
Solid
Item Weight
1.67 Pounds
Liquid Volume
1 Liters
Manufacturer
Seachem Inc.

🧬Maximized surface area for bacteria colonization

♻️Supports full nitrogen cycle: nitrification & denitrification

🇺🇸Proudly made in the USA

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385 kr

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Details

Brand
Seachem
Item Form
Solid
Item Weight
1.67 Pounds

Description

♻️ Transform your aquarium’s ecosystem with nature’s ultimate biofilter!

TRUSTED PROVEN - Backed by thousands of 5-star reviews and crafted by Seachem, a leader in aquatic health solutions.
BIOFILM POWERHOUSE - Engineered porous matrix offers unparalleled surface area for beneficial bacteria growth, ensuring crystal-clear water.
VOLUME BASED PRECISION - Sold by volume, not weight, to provide consistent filtration capacity regardless of moisture content.
NATURAL MINERAL VARIATION - Authentic mined media with unique color and texture variations, guaranteeing genuine quality and performance.
COMPLETE NITROGEN CYCLE SUPPORT - Facilitates both aerobic and anaerobic bacteria, reducing harmful ammonia, nitrite, and nitrate buildup naturally.

Seachem Matrix Bio Media is a premium, USA-made natural filtration substrate designed to maximize beneficial bacteria colonization. Its unique porous structure supports both aerobic and anaerobic bacteria, enabling a complete nitrogen cycle that reduces ammonia, nitrite, and nitrate levels for healthier aquatic environments. Sold by volume with natural mineral variations, it’s a trusted choice among aquarium professionals and enthusiasts alike.

Specifications

ASIN	B0002A5VIO
Allergen Information	Gluten Free
Best Sellers Rank	#25,806 in Pet Supplies ( See Top 100 in Pet Supplies ) #252 in Aquarium Filter Accessories
Brand	Seachem
Brand Name	Seachem
Customer Reviews	4.8 out of 5 stars 2,967 Reviews
Global Trade Identification Number	00000116011709
Included Components	all
Item Form	Solid
Item Type Name	Aquarium Filtration Media
Item Weight	1.67 Pounds
Liquid Volume	1 Liters
Manufacturer	Seachem Laboratories, Inc.
Manufacturer Part Number	117
Model Number	117
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	000116011709 716184580831
Unit Count	1 Pounds
Warranty Description	Warranty

Reviews

I**3

21.01.2026

H**T

27.04.2026

R**M

12.11.2014

C**S

13.02.2026

T**A

30.08.2025

P**F

3.01.2021

M**N

11.11.2025

G**E

7.10.2025

I**E

24.01.2026

お**ざ

29.12.2025

G**A

13.11.2021

A**8

29.06.2017

G**E

29.03.2026

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