Dennerle CO2 Set Carbo Bio Start 60 is a bio CO2 fertilisation system for freshwater aquariums. The Carbo Bio Start 60 bio CO2 fertiliser system supplies all freshwater aquariums up to 60 litres with vital CO2. It is ready for operation in just a few steps. CO2 production starts after 24 to 48 hours. A pressure-resistant CO2 hose and a CO2 Mini-Topper specially designed for low operating pressure - or optionally, a CO2 Injector for connection to a Dennerle Corner Filter 40 or 60 - ensure fast, effective dissolution of the valuable CO2 in the aquarium water.Dennerle BIO CO2 exploits the well-known fact that yeast cells are able to produce CO2 from sugar in the absence of oxygen. A problematic aspect is the fact that a fermentation process with pure sugar normally begins at a very fast pace, only to drop away substantially after just a few days. As a result, the aquarium receives too much CO2 at the beginning, and too little shortly after. In contrast, Dennerle BIO CO2 with CO2 control g