SKU: 94545722369

Seachem Matrix

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Description

Seachem MatrixSeachem Matrix Matrix is a high porosity bio media that provides efficient biofiltration for the removal of nitrogenous waste. Matrix is a porous inorganic solid about 10 mm in diameter. Each liter of Matrix provides as much surface (>~700 m2) as 170 liters of plastic balls! Plastic bio materials provide only external surface area, whereas Matrix provides both external and internal macroporous surface area. These macropores are ideally sized for the

Seachem Matrix

Matrix™ is a high porosity bio media that provides efficient biofiltration for the removal of nitrogenous waste. Matrix™ is a porous inorganic solid about 10 mm in diameter. Each liter of Matrix™ provides as much surface (>~700 m2) as 170 liters of plastic balls! Plastic bio-materials provide only external surface area, whereas Matrix™ provides both external and internal macroporous surface area. These macropores are ideally sized for the support of nitrifying and denitrifying bacteria. This allows Matrix™, unlike other forms of biomedia, to remove nitrate along with ammonia and nitrite, simultaneously and in the same filter.

Matrix™ is completely inert and will not breakdown. It need not be replaced. Since the majority of the bacteria are internal, Matrix™ may be rinsed when needed without damaging the filter. Matrix™ is compatible with all types of wet or wet-dry filters.

  • High capacity biofiltration
  • Controls ammonia, nitrite, and nitrate
  • Highly porous - enormous surface area (>~700 m2/L)
  • Supports aerobic and anaerobic bacteria species

Directions

Use 250 mL of Matrix™ for each 200 L (50 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.

**This dosage may differ from your packaging. Based on updated studies, we've found Matrix™ treats even more water than previously asserted.

A: We certainly understand why people look at Matrix™ and compare it to pumice; they are both porous stones. But remember, not every porous stone is the same. Matrix™ is a specific type chosen for its extremely high porosity, pore size, durability, and inert nature. When you buy Matrix™, you know what you are getting. It has been tested in the lab and in thousand of hobbyist's aquariums for more than a decade with excellent results. You aren't just purchasing the physical material when you buy a container of Matrix; you are purchasing the research which has sourced and tested this specific type of stone, and the assurance that it is safe for use in your aquarium.

A: Nothing’s wrong. The product is working just as it should. The removal of nitrates essentially comes down to one parameter: rate. The rate at which your tank is producing nitrates and the rate at which it can remove them. If you fill a bathtub with the spigot wide open and try to keep it from overflowing by draining it out of a straw, it won’t be long until it overflows. However, if you drain it at the same rate it fills, the level will always stay the same. Or, if it nearly fills up and then you drain it at a rate faster than it is filling, the level will drop. The same applies to nitrate removal. To lower nitrates you must equip your tank with the capacity to remove them at a rate greater than or equal to the rate of formation. So, if your nitrates are holding steady and you want them to come down, increase the amount of Matrix™ you are using or use de❊nitrate in addition to the Matrix™ (de❊nitrate will more efficiently remove nitrates per volume of product assuming a flow rate of not more than ~50 gallons/hour). If you need to use a higher flow rate, than stick with Matrix™ or try Pond Matrix™, both of which support anaerobic denitrification at higher flow rates.

A: Matrix™ is a biomedia, meaning it does not exhaust over time, so you should never need to replace it. That said it is possible for Matrix™ media to become clogged up with detritus and slime, so we recommend regular filter maintenance to ensure it continues working as efficiently as possible. The frequency with which a canister filter needs to be opened and cleaned out varies from tank to tank, but a good starting point is once a month.

A: We recommend that water flow through filter media in this order:
1. Mechanical filtration (filter floss, sponges, etc.)
2. Chemical filtration (MatrixCarbon, PhosGuard, Purigen, etc)
3. Biological filtration (Matrix)
Every filter is different, so the exact placement of Matrix™ will vary from brand to brand.  Consult your filter’s instruction manual to find the direction of flow for your filter.

A: This all depends on the stage of biological establishment of your tank, placement of Matrix™ and flow rate. Generally you will start to see improvement in a couple of weeks but every situation varies.

A: No, It is an inert media that will not directly impact your pH.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 94545722369

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Paul
Charlottesville, US
★★★★★ 4
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Color: Green, Color: Green
I bought this puzzle toy as a birthday present for my dog. She loves it!!! It took her a minute to get the hang of it but now she’s a pro at getting the treats out. It’s durable and easy to fill. I have it for 3 months and there is no damage to it. She hasn’t chewed it but once in a while she will carry it around hinting she would like it filled. The price point is great.
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Reviewed in the United States on May 18, 2026
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Deborah Swaney
Grantham, US
★★★★★ 5
Fun Brain stimulating puzzle toy
Color: Green
this is a Great Puzzle/brain toy for puppies! My Dog really enjoys interacting with it! It is well made and larger than most of the ones I saw.. sturdy stable and very good for puppies to use their brain to figure out how to get a treat!! recommend highly and price was fair and shipped very quickly
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Reviewed in the United States on April 23, 2026
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Verified Purchase
Grace H.
Natrona Heights, US
★★★★★ 5
Definitely recommend this product
Color: Green
Very pleased with this item - it is very similar to the Outward Hound brand but less expensive. I chose this product which doesn’t have easily removable parts - they would be a chocking hazard. Overall it seems durable, engaging and chew resistant - as long as your dog is supervised
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Reviewed in the United States on June 7, 2026
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Verified Purchase
J CASSIN
Boise, US
★★★★★ 3
Needs improvement
Color: Green
The cups are deep enough and the bone has to have the circle to rotate before the bone can move. I had a hard time figuring it out and so has Our dog . There are 4 black rubber parts included but no instruction on what to do with them. After seeing the toy move across the floor, I figured out these needed to go on the bottom 4 corners. Cute, but needs improvement.
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Reviewed in the United States on May 8, 2026
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Keau
Whiting, US
★★★★★ 5
Great treat toy
Color: Green
Great toy for mind stimulation. Somes i feed her in this especially when i have to leave her at home for couple hrs. Best toy for beginners dogs who is new to these type of toys. Recommend. Our other dog husky mix still needs assistance on using it but she is getting there.
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Reviewed in the United States on May 5, 2026

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