Aqueon® Pure Aquarium Water Supplement for 10 Gallons TankBrand Aqueon Item Form Gel Target Species Fish Allergen Information Allergen Free Manufacturer Central Garden & Pet About this item Add one PURE per 10 gallons of tank water each week. Add two PURE per 10 gallons of tank water when starting a new aquarium Easy to dose gel ball Live beneficial bacteria that breaks down harmful waste Cannot be overdosed Helps maintain clear water Safe for all freshwater aquariums