Comes with pump, sanitary filter, tubing, and Stainless Steel 2 micron diffusion stone. This system will never run out of oxygen. Additional sanitary filters sold separately.
Aeration is a necessary and important step in the brewing process that adds oxygen into the wort for the yeast to reproduce. This is the only time you want to expose your beer to oxygen. Add oxygen to your wort after the chilling process. If oxygen is added while the wort is still hot this will create off flavours in your beer.
Tip: Huge step up from rocking carboys back and forth. This system also eliminates the need for oxygen tanks.