HA3PKAQ1 Size: 1 oz. Pictured in 4 oz. Features: -Aquarium Cycling and Water Conditioning Kit.-Detoxify and condition new water and rapidly cycle new tanks with fish.-Biologically reduce organic waste and control ammonia.-Nitrite and nitrate for a healthy clean aquarium.-Made in United States. Options: -Available in 1 oz. and 4 oz. sizes.