Seachem Flourite Dark

Flourite® is a specially fracted stable porous clay gravel for the natural planted aquarium.
Its appearance is best suited to planted aquaria but may be used in any freshwater aquarium environment.
Flourite® is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels.
Gravel modifiers such as laterite are not necessary. Flourite® is not chemically coated or treated and will not alter the pH of the water.
Flourite® is good for the life of the aquarium and need not be replaced.