Carib Sea Crushed Coral 15 Lbs

Florida Crushed Coral"

It's the only crushed coral with aragonite, which provides up to 25
times the buffering power of other crushed corals, dolomite, or
oyster shell. Use in undergravel filtered systems or reverse flow
beds. A solid and economical performer.
Grain size 2.0- 5.5 mm..