- Extra large size extremely porous filtration medium for use in all reefs, marine, freshwater aquariums & ponds.
- Used for biological filtration, nitrification, and denitrification.
- Reduces level of toxic ammonia, nitrites, nitrates, phosphates, and other organic pollutants.
- Can be used in a canister filter, reactor, or other type of aquarium filter with good water flow.
- Made in the USA.
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