Glamour Stone has an artificial shell and should therefore only be rinsed briefly with cold water before use. Do NOT wash the gravel with warm water and not warmer than the aquarium water. It is pH-neutral and uses a special resin, does NOT release any substances into the water and is guaranteed non-toxic. The gravel fulfils the requirements of DIN EN 71 and can therefore be considered non-toxic. These trendy glamour stones make it possible to find the right colour for your aquarium. Whether you like natural colours or slightly more cheerful colours, anything is possible with Aqua D'ella Glamour Stones.