Flourite Black is not chemically coated or treated and will not alter the pH of the water. Flourite Black is good for the life of the aquarium and need not be replaced. Premium natural substrateCan be used in any freshwater aquarium environment. Good for the life of your aquariumWill not alter your aquariums pHNot chemically coated or treatedINSTRUCTIONS: Although it is pre-washed, because Flourite Black is a natural product, it may become dusty in transit and require rinsing before use to remove any residual dust. When adding water to your aquarium, fill slowly to avoid disturbing Flourite substrate bed.Place a bowl in the aquarium and add water directly to the bowl, allowing water to overflow softly on to the gravel bed. To remove cloudiness, use mechanical filtration (such as filter floss). This item is in the category "Pet Supplies\Fish & Aquariums\Aquariums & Tanks". The seller is "exclusivecollectionstores" and is located in this country: US. This item can be shipped worldwide.