Stainless steel 2 micron diffusion stone is useful for aerating wort
with room air and an aquarium pump or oxygen. Barbed fitting, fits 1/4" I.D.
Do not touch the stone with your bare hands. The oils in you hands can clog the small pores. If you do clog the pores simply boil the stone to remove the oils.
To clean and sanitize just boil the stone.