Aqua Soil Amazonia is produced from natural soil, and its source material has a sprinkling of sand granules. So the product may have a limited amount of white and red color stone particles, and fraction of plants. These are originally contained in the source material, and they do not affect the product features and water condition of aquarium, and are completely harmless in plants, fish and shrimps. So please be assured that these materials do not undermine Aqua Soil Amazonia’s product features, and the product can be used without any worries.
> Aqua Soil - Amazonia Product Information（アマゾニアへのリンク）