API STRESS COAT Aquarium Water Conditioner is a product designed to improve the water clarity and quality in all types of aquariums. Made by the reputable brand API in the United States, it helps to remove harmful chemicals like chlorine and bacteria, as well as reducing iron and copper levels. This water conditioner is available in four different sizes to suit the needs of various aquarium setups, providing a safer and healthier environment for fish and other aquatic animals.