The mico-organism multiplier. 
 
BAC Daily (formerly 'Rotalumits') is a vegan, organic additive that encourages the multiplication of beneficial micro-organisms in your medium, improving the absorption and transport of nutrients throughout the plant. These micro-organisms facilitate the creation and binding of oxygen in the capillary and help protect against various diseases. BAC Daily also increases the pH value near the root.
 
BAC Daily also has a cleaning effect that prevents drippers and hoses from becoming blocked.