- Product Dimensions: 7.9 x 3.7 x 3.7 inches ; 1.67 pounds
- Shipping Weight: 1.7 pounds (View shipping rates and policies)
- ASIN: B0002A5VIO
- Item model number: 116011709
- Average Customer Review: 208 customer reviews
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Seachem Matrix Bio Media 1 Liter
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- Supports denitrifying bacteria
- Extreme surface area
- No need to replace ever
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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.
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DirectionsUse 250 mL of Matrix™ for each 100 L (25 US gallons) of water. Matrix™ may be placed in any kind of filter, and is particularly effective in a canister filter. Matrix™ is sufficiently large that no filter bag should be required for most applications. Matrix™ works well in drip tray systems, but you may find that the larger Pond Matrix™ is better suited for such applications.Use with Stability® to more rapidly establish the bio-filter.
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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.
Use and over use this stuff!
9/19/2018 Added to each filter 250ml Matrix+Stability. Nitrate levels at 20-40 ppm
Oct 2018 Continued using Stability at water changes and in between, levels down to 10-20
Dec 2018 Added 1 liter Matrix to each canister (each now have 1250ml), removed all of Eheim substrat pro, now only Matrix, continued adding Stability as before.
Jan 2019 Continued adding Stability as before, Nitrates consistently measuring 10-20 ppm; then consistently 10 ppm.
Feb 25 2018(Today) Success! Consistently Nitrate level at 10 ppm.
Soon I will add another 250ml to each canister and I am pretty confident that it will be below 10 ppm Nitrate or I'll keep adding another 250ml Matrix to each until I get it below 10 ppm.
Update: so there were only 4 pieces of obsidian in the whole bottle, so it's not a big deal. The media is really dirty though and you'll need to wash it thoroughly before use.