Seachem Prime is a highly concentrated water conditioner that effectively makes tap water safe for freshwater and marine aquariums. It removes chlorine, chloramine, and detoxifies ammonia, nitrite, and nitrate, ensuring a healthy environment for your fish. Just a small dose treats a large volume of water, making it both economical and efficient. Prime also helps to promote the natural slime coat of fish, providing an added layer of protection. It’s a must-have for any aquarium owner looking to maintain pristine water quality. 250ml container. This container will treat 2,500 gallons.