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MarinePure High Performance Biofilter Media Block


Item #: 0P2035

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MarinePure High Performance Biofilter Media Block

MarinePure`s bio-media is the most technically advanced bio-media available today, designed to be a substrate for bio-filtration, specifically targeting ammonia and nitrite removal, minimizing denitrification.

MarinePure is the perfect place for beneficial bacteria to flourish in order to remove harmful fish wastes, eliminating ammonia and lower nitrates.  

Thin Bio-Film Technology

Combination of vast surface area and open/interconnected pores allow a thin bio-film to develop. This thin film allows bacteria to flourish because necessary nutrients are immediately available. With the open pores, old dead bio-film is easily flushed from the media and will not plug the media. Water flows through the media, not around as with other denser medias, thus utilizing the most surface area for beneficial bacterial growth.


  • Thin Bio-Film Technology™
  • For freshwater and marine aquaria
  • Vast surface area
  • Open porosity
  • Designed for ammonia and nitrite removal
  • MarinePure is inert and will not harm aquarium inhabitants
  • Reduces tank maintenance
  • Allows a higher bioload
  • Can use a smaller filtration footprint
  • Shape to fit
  • Use in sumps, under gravel, canister filters, etc.


  • Treats up to 250 gallons
  • Dimensions (LxWxH) = 8" x 8" x 4"
  • Surface area = 23000 ft2

Nitrification: Minimum recommended amount for eliminating ammonia and nitrite in an active filter for a typical bio-load
Tank Size Plates Blocks
50 Gallons < 1 Plate < 1 Block
100 Gallons 1 Plate < 1 Block
250 Gallons 2 Plates 1 Block
500 Gallons 3 to 4 Plates 1 to 2 Blocks
2500 Gallons 12 Plates 4 Blocks

Denitrification: Recommended amount to minimize nitrates in a passive filter with a typical bioload.
Tank SizeBlocks in passive location
50 Gallons
1 block
100 Gallons
1 block
250 Gallons
2 blocks
500 Gallons 3 blocks
2500 Gallons15 blocks

* MarinePure`s thick blocks are designed to be used in passive systems to control Nitrates (like live rock). If used in active systems they will eliminate ammonia and nitrites (nitrification).

5 Stars


Reviewed on
December 12, 2020

Yes, I would recommend this.

Bio Media King

Pros: Lowers Nitrate, does its job

Cons: Might arrive broken

Highly recommended, lowers levels including nitrate. Fragile so don't drop it! Will use in all my sumps.

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Reviewed on
July 10, 2020

Yes, I would recommend this.


Very good product, hight quality, great size.

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Reviewed on
July 04, 2019

Yes, I would recommend this.

A Must!

Pros: Perfect for holding beneficial bacteria

Cons: None

Perfect for holding beneficial bacteria. Won’t start a tank without it

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Reviewed on
June 22, 2019

Yes, I would recommend this.

I always used the plates instead of mud in my refugium

Pros: great for pods and bacteria

Cons: big if you have a smaller tank you might have to cut it

I love the marine pure block I usually get the plates but this stuff you can cut with a saw so it way cheaper and great for your pods and bacteria

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Reviewed on
June 04, 2019

Yes, I would recommend this.

Works great.

Pros: Very pourous and durable

Cons: None

I have this in my marine depot sump refugium. And it filters alot of the nitrates out. I went from around 80 down to 20. Would gladly purchase again.

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Reviewed on
March 25, 2019

No, I would not recommend this.

soft, brittle

Pros: does work as biomedia

Cons: soft, grossly over priced.

Falls apart when you touch it. It is so soft that it is difficult to work with as it sheds fine particles whenever it is moved. It hasn't disintegrated like with the complaints seen online in the past, but when gently touched or hit it does lose material. I would not recommend this nor buy it again. I hear the Brightwell product is harder.

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