The Tetra AquaSafe Water Conditioner is a 3.38 fl oz (100ml) bottle designed to treat water in freshwater and tropical aquariums. This product, made in Germany by the brand Tetra, is specifically formulated to neutralize chlorine and stress factors in the water, promoting overall water quality for healthy fish. With the ability to treat up to 100 gallons of water, this water conditioner is a convenient and effective solution for maintaining healthy conditions in your aquarium.