25gram pack,great biological filter, but it also removes medications and some minerals. However, active carbon has no lasting effects so it’s easy to change in and out as your needs require
Activated Carbon is safe for both freshwater, saltwater, and pond environments
Removes odors, discoloration, and impurities to keep water crystal clear
Tips: As with all aquarium carbon media, always rinse thoroughly to remove excess dust till the water runs clear before use.
A great addition in terrarium, Mosarium,It can also be mixed in the soil of houseplants to keep them healthy.
Many use product.