can this be used in a water filtration system? (For people not fish).

Yes. I used it for years. I filtered drinking water as it was produced from a water distiller. If it does not kill fish it will not harm you either.

how much carbon should I put in my 40 gallon tank

depends on water volume and bioload. good general rule is 1 tablespoon carbon to 10 gal. of total system volume on a light-moderately loaded tank/system. change every 10-14 days. adjust to taste ;). remember-main function is to remove tinting organics-not a replacement for water changes overall. from a long time pro aquarist and hobbyist.

We have marineland penguin power filter w/ multi-stage filtration. how much of this carbon do i put on a 50 gal. tank?

From Marineland's webpage, it looks like some Penguin doesn't have a refillable filter cartridge for carbon. The carbon is placed in a refillable filter cartridge. Do not put the carbon directly into the tank. Look inside the Penguin for a rectangular grey colored "basket-like" object. Remove it and press a tab on the filter to open it. Replace the existing expended carbon material with the fresh Black Diamond Media. Reconfigure the cartridge and rinse it in fresh water to remove carbon dust. Replace it in your Penguin and wait a day or two for the water to clear. Good luck.

When using this to make better cat litter: If it's pebbles, wouldn't it get scooped out when you scoop the litter? Do you pulverize it before mixing?

Hello Kevin,I'm not sure I would recommend either.In the simplest terms most activated carbon is a coal product that has been baked.That's near as organic as you can get but don't lose sight of how many metals occur in the same space as a coal vein.Some of the cheaper carbons available are notoriously high in iron.This happens to be one of the better carbons in the category.Iron is not something you want in your reef so I have a habit of running a magnet around the jar before I use it and I've never had a jar of this that had much move.So from the standpoint of could this hurt my cat I don't have much concern.BUT......Carbon is dirty.This being a pelleted carbon it is less dusty than granular versions but do you want your cat sitting in or scratching on something that will leave a residual black stain that can then be dragged around the house?Pulverizing it would only make it far more dusty.Though I think this is a fine product for filtering water which is what it is manufactured for I think there are better products available for controlling odors in cat litter.If you have your heart set on using this for that purpose then I would think putting it a net bag or cutting up some old panty hose and keeping it secured that way and putting it in the corner of the litter box would be the way to go.That way you could also rinse it under cold water once in the bag and let it air dry for a day before using.

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Reviews

8**4

GREAT quality, we're very pleased with this carbon.

We work hard for the money and are happy with this move getting this carbon. The container was larger than I anticipated (22oz here). Outstanding activated carbon at a great price. I've been a fish tank caretaker for over 30 years and imho it rinses clean fairly quickly, and yes indeed you hear that rice krispies snap cackle pop sizzle coming from the carbon right after rinsing it which is a great sign of great quality. I am first using this for cat fountains with mesh zipper bags not filter material and it does not slip through the 1-layer mesh, so rocks are small but large enough it should not be an issue with say, whisper bio bags.

30.07.2025

T**N

Great for my fish tank

Work great in my fish sump tank

14.01.2026

H**R

Aquarium is crystal clear!

This product made my aquarium water crystal clear!!! I love it! I also use it in my pet fountain! Very happy with this product, the size, and price is good too.

14.10.2025

N**I

Activated carbon for tank

Quality is great both water cleanliness and quality is good with this product. Overall performance with ammonia level and health of the tank is great with this product.

29.07.2025

J**Y

I use this for my cat litter

These smell great, and is great to add to a cat litter box. Someone in a review recommended that and I'm glad I tried it. The cats don't mind it, and probably love it because it brings the smell down. It has a high carbon content that you can smell its also black in color and very effective.

17.09.2025

A**R

Good Price For It

Works very good in filtering in the fish tank.

15.10.2025

D**W

Great for Goldfish tanks

Quality products

17.01.2026

A**R

life saver

I have a pet turtle whose tank just can't seem to stay clean! After replacing the carbon in my filters with this product, I can't recommend it enough. The smell from his tank seemed to improve instantly, and the water just seems cleaner overall.

23.10.2025

N**D

I use this for the storage room that has bunch of shoes, it helps decrease the smell and the stuffiness of the room even with the door closed. I also use it for my diaper pail for my baby and helps lock the smell in for days. Good quality and good amount for the price

21.11.2019

V**F

Good one

4.11.2023

A**R

Good

30.10.2021

S**N

Cheaper than most and works just as good.

19.12.2024

C**A

Muy bueno para eliminar olores. Yo lo puse en un filtro improvisado en un despachador de agua que servía el agua sabor plástico y funcionó muy bien. También le pongo a mis zapatos envuelto en una servilleta o calcetín viejo con bicarbonato de sodio 👍🏻

24.02.2020

ASIN	B0002566WY
ASIN	B0002566WY
Age Range Description	1
Best Sellers Rank	#3,003 in Pet Supplies ( See Top 100 in Pet Supplies ) #11 in Aquarium Water Treatments
Brand Name	MarineLand
Color	Blacks & Grays
Country of Origin	United States
Customer Reviews	4.7 4.7 out of 5 stars (11,784)
Date First Available	June 20, 2004
Date First Available	June 20, 2004
Department	Unisex-Adult
Department	Unisex-Adult
Directions	Place the carbon in your aquarium filter according to the filter manufacturer's instructions
Included Components	See Label
Is Discontinued By Manufacturer	No
Item Dimensions LxWxH	5.5 x 5 x 10 inches
Item Package Dimensions L x W x H	10.12 x 5.62 x 4.8 inches
Item Weight	0.01 Ounces
Item model number	PA0373
Item model number	PA0373
Manufacturer	Marineland
Manufacturer	Marineland
Material	Plastic
Model Name	Diamond Media Premium Activated Carbon
Number of Items	1
Product Dimensions	5.5 x 5 x 10 inches; 0.01 ounces
Size	40 ounce
Specific Uses for Product	Aquarium
Style	Carbon
Target Audience Keyword	fish

Marineland Black Diamond Premium Activated Carbon, Filter Media For Aquariums, 40 Ounces

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