An efficient, sanitary, and inexpensive way to aerate wort in the primary fermenter. The aquarium pump forces room air through the sanitary, in-line HEPA filter which removes dirt and contaminants. Then the air is delivered to the wort through a stainless steel diffusion stone, which promotes rapid absorption into the wort. For best results, aerate your cooled wort for 20-30 minutes. *Carboy and bung not included.