A piece of lime-wood or porous stone, whose purpose is to gradually diffuse air into a water tank, eliminating the noise and large bubbles of conventional air filtration systems.
SIUE STEM Resource Center
http://www.siuestemcenter.org/
Southern Illinois University Edwardsvillehttp://www.siuestemcenter.org/
Science East, Room 1276
Edwardsville, IL, 62026
USA
618-650-3065