Key Features Official biOrb Biological Booster Improves water quality using natural bacteria Perfect for each time you change water or change filter 100ml bottle 5 pumps per 15L of water The Oase biOrb Biological Booster is an ideal aquarium water treatment solution designed to help keep your aquarium water healthy and clean. The biological booster includes natural bacteria that will boost the overall water condition of your biOrb. This is perfect to use during a water change or when replacing your filter cartridge. Specifications Quantity: 100ml Dosage: Five pumps per 15 litres of water