This nano CO2 kit comes with a Bio CO2 bottle with a starter capsule, bottle support, CO2 short and long hose, bubble counter, and CO2 injector. Produces over 300,000 bubbles. For aquariums up to 30 gallons. When system is applied correctly CO2 will begin within 24-48 hours and your aquarium will be supplied with CO2 for at least 30 days. This is a yeast sugar based CO2 kit.