The API Super Strength Tap Water Conditioner for Fish Aquariums comes in a convenient 2-pack of 16 fl oz bottles. Specifically formulated to treat tap water, this water conditioner is designed to provide a safe and healthy environment for fish in your aquarium. The API brand ensures quality and effectiveness in maintaining the water quality for your aquatic pets. Perfect for regular use or when setting up a new aquarium, this water conditioner helps to remove harmful chlorine and other chemicals, allowing your fish to thrive in a clean and healthy environment.