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Your cart is empty.Matrix is a highly porous media designed to provide exceptionally efficient bio filtration for single site removal of ammonia, nitrite, and nitrate from freshwater, marine, and reef aquaria. Each liter of matrix provides over 160,000 cm2 (170 sq. Ft.) of surface, equivalent to over 40 L (10 gallons) of typical plastic ball media! this product is sold by volume. Cited weight is minimal weight. Matrix is a naturally mined, chemically inert material for facilitating the growth of biological filtration in aquarium and pond systems. Due to its organic nature - size, shape, coloration, and density of the matrix material will vary slightly between packages. Any of These variants and small irregularities in sizing are perfectly natural and will not affect the integrity of the product or its ability to maintain water quality. It will also not affect pH in the system.
Leandro
Reviewed in Mexico on June 4, 2025
Eso no es los mejores medios filtrantes
Davy
Reviewed in France on September 17, 2024
Bon produit mais est ce utile de mettre des cailloux pour faire plus de poids j en suis pas sur mais dans tous les cas excellent produit pour les bacteries
stargazer
Reviewed in the United States on August 26, 2024
Seachem is a great product. I use these bio media in two of my Tidal 75 filters to provide space for beneficial bacteria to thrive. Like all bio media, in time the tiny pores will get clogged and no longer work and need to be replaced. This is a great replacement. 1 liter bottle will last me for quite some time.
Kenneth Noll
Reviewed in the United States on August 24, 2024
Rinse the dust off and put it a mid basket of you filter. Great addition to a functional filtering system from a respected brand
Joseph Gigliotti
Reviewed in Canada on March 5, 2024
Helps keep the water stable. Very happy.
tomo.k
Reviewed in Japan on November 4, 2024
もう数回購入していますが、初めてレビューします。メインフィルターの瀘材は全てマトリックス+初回にバイコム21pdですが、明らかに硝酸塩が減ります。生体数にもよるでしょうが…あとメチレンブルー使ったら綺麗に青色に染色されてしまうので通水性が悪くなるかもしれません…物理濾過→粗めスポンジ＆キャビティ生物濾過→マトリックス＆バイコム21pd化学濾過→ブラックホール＆エーハイムリン酸除去材これで上手くいってます
George A. Schmid
Reviewed in the United States on December 18, 2022
There simply is no better bio media on the market. Heck, there is no other bio media even close to matching the quality of Matrix. Each piece is light weight and holds about an infinite amount of tiny holes for bacteria to colonize. The holes closer to the center of each piece are perfect for creating an anerobic environment for bacteria to colonize and digest nitrates. The holes closer to the edge of each piece, which are where the majority are located, are perfect for aerobic bacteria that consume ammonia and nitrites. All this results in better water quality is more capacity for livestock. Don't buy another brand of bio media, as it will be subpar to Matrix.
GanNiNa
Reviewed in Singapore on November 13, 2021
It came unsealed. Some of the bottles weighs lesser than the other bottles..not too sure on the authenticity of the product.
P Shif
Reviewed in the United States on January 3, 2021
This product is well known for being excellent at providing a place for beneficial bacteria to grow and flourish. It is not overly expensive so I got some and added it to one tray in my cannister filter. It, along with a tray that has a bioball/ceramic ring combo makes up the bulk of my biological filtration with a large coarse sponge pre-filter helping also. This should be more than enough to handle my 75 gallon tank. I also have some sponge media for mechanical filtration but I like to rinse these with tap water so that the bacteria multiplies where I want it and not on the sponge that will eventually get replaced.The only issues I have are 1. There is at least half of this that is very dense like a rock. It is not all porous. That is not a deal breaker because I want bacteria growing in different ways and hopefully I will attract different types. 2. This really does need a bag to hold it. It will work in the cannister but the smaller pieces move and get wedged under the tray handles preventing it all from stacking correctly. I fit this into two media bags and this just makes it easier to clean but you will need to purchase a bag.Overall, based on reputation alone this is worth having in a tray. There is enough porous rock to justify the cost and now I have a nice diverse set of media in my filter working 24 hours a day.
Ray Sundstrom
Reviewed in the United States on November 12, 2014
Seachem Matrix is a great natural medium for colonizing both nitrifying and denitrifying bacteria so important for good water chemistry and the health of one's aquarium inhabitants.I noticed many users have complained about receiving an adulterated product, and frankly I thought I had received one as well. I called Seachem and got the scoop. Here's what I found out:Matrix is a natural, mined product. The mineral has natural variations in size and color. When mined, black Obsidian is sometimes included in the take. The Obsidian is removed by hand before packaging, but some slips into the container from time to time.The packaging does not have a tamper-proof seal beneath the lid. When you open the jar, you immediately see the product.Matrix is sold by volume and not by weight. A minimum weight is listed in the literature (e.g.: 1 liter of Matrix = 400 gram net weight) but this is required by law, and has nothing to do with the actual weight of the product, which can vary greatly due to Matrix absorbing moisture from the air, for example. The 1 liter of Matrix I received weighted 967 grams out of the jar.When you receive Matrix, expect it to vary in color, size, and that there may be a few dark or black rocks in the jar.Now for the actual use. Matrix provides a tremendous amount of surface area. The outer surfaces and crevices provide a very hospitable environment for the aerobic (oxygen consuming) nitrifying bacteria that make up the 'bio filter' so critical to breaking down Ammonia to Nitrite, and Nitrite to Nitrate.It's benefit doesn't stop there. At the end of the aerobic portion of the Nitrogen Cycle, nitrate is left to build up in the water column, and is one of the major pollutants that dictate the frequency and quantity of water changes. Nitrate can be reduced to Nitrogen gas - but this is an anaerobic (oxygen deprived) process requiring another type of bacteria. Nitrate laden water seeps into the core of Matrix after having been stripped of oxygen by the aerobic bacteria on the medium's surface. This oxygen-poor environment is perfect for colonizing anaerobic bacteria that consume Nitrate and release inert Nitrogen gas.This final step in the Nitrogen Cycle helps control the buildup of Nitrate in the aquarium, contributing markedly to the long term health of it's inhabitants.
lethalmaniac
Reviewed in the United States on September 10, 2012
I have a 55 gallon freshwater tank with 34 fish. I have a fluval 306 cannister filter with included media. I do regular 30% water changes weekly and filter cleanings weekly. My water was pretty clear from the front of the tank but looked like a brownish tint from the side (Not Tannins). There were a few times that it was absolutely crystal clear from the side view so I knew it could be clear again! I read that dissolved organic materials need to be removed from the water through water changes or filtration media. I tried to do 2-30% water changes a week and still the brownish tint from the side. I read about 2 Seachem products - 1 Liter Matrix Bio Media and 100ml Purigen Bags. I called the company to get the low down on this stuff and apperantly it is supposed to add much more bacteria to filter and also clarity to water by removing dissolved organic materials. I did a 30% water change, cleaned my filter, left old biomedia in and added the new Matrix. I got 75% of the new Matrix Bio media to fit in the cannister. I will fit the rest in when the new media starts building bacteria. I also added the 2 Purigen Bags to the cannister. I went to bed and in the morning the water was crystal clear. Its been 3 days and still crystal clear-from the front and crystal clear from the side. I am not sure if it was the Matrix or the Purigen that made my water clear but for the cost I would recommend getting both! I will update this if I find that this is just a temporary fix.
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