Many will argue that the 2 Micron is the perfect stone for oxygenation with a normal air pump as well as Pure Oxygen, we'll let you decide which is better!
 
Please Note:
Do not touch the stone with your bare naked fingers! The oils in your skin will clog the tiny pores. Please handle with gloves.
 
Clogged Stone?
The best method for unclogging a stone is to pump CO2 at about 1-2psi  through the stone and use an electric kettle to boil the stone for atleast 5 minutes. Then store in a ziplock bag until next use. 
If that is not an option we recommend using some StellarSan sanitiser to remove bacteria from the outside and can help unclog the stone.