STORE PICK UP ONLY - Does not ship Specially fracted porous clay gravel for natural planted aquariums Packed with micro nutrients to promote healthy plant growth Not chemically treated or coated - won't alter your aquarium's pH Last the life of your aquarium - never needs replacement. Seachem Flourite Sand is a specially fracted stable porous gravel for the natural planted aquarium. Although it may be mixed with other gravels, Flourite Sand is best used as an integral substrate bed. Any mixture should be at least half flourite. Gravel modifiers such as laterite are not necessary. Flourite Sand is not chemically coated or treated. Although pre-washed, it should be rinsed before use to remove residual dust. Slight initial cloudiness is normal and will clear rapidly.