I have been using it in my marine aquarium for over 3 years. This is a 55 gallon hex tank and I use 3 bags at a time in my canister filter. Also use mechanical filtration and biological media. The water remains perfectly clear and odorless. I placed a 100 micron sheet and cotton swab in front of the material to trap the carbon and keep it from seeping into groundwater. After rinsing out the carbon bags, make sure you have something like this before the water drains back into your tank, otherwise you'll have cloudy water for a while and think it's not doing your fish any good.
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