The 7 kilogram container of Seachem Flourite Sand is designed specifically for use in freshwater planted aquariums. The fracted stable porous clay gravel is most effective when used alone, but can also be safely mixed with other gravels as well for additional aesthetic designs. The Seachem Flourite Sand is not chemically coated or treated, will not alter the pH balance of the water and it does not need to be replaced, as it is good for the life of the aquarium. Mechanical filtration will help to remove any residual cloudiness from the product.