Our algae removal powder (boxed) contains copper oxide, activated carbon. It can purify the water, remove fish droppings, improve the purity of the water, reduce the smell of algae, and keep the fish tank clean and healthy. The ingredients are mild and safe, and will not harm your fish or aquatic plants while removing algae. The way to use it is very simple: take a spoonful of this product and add it to the water in the aquarium, and wait until the water becomes clear. This product can quickly remove algae, purify water, and keep water clear. Suitable for all types of aquariums, it is a safe fresh and salt water reliever to help you enjoy crystal clear aquariums.