**hhhmm.. not getting where y'all getting this kaboom from, pure 02 will NOT ignite on its own..
from wiki::
Highly concentrated sources of oxygen promote rapid combustion.
Fire and
explosion hazards exist
when concentrated oxidants and fuels are brought into close proximity; however, an ignition event, such as heat or a spark, is needed to trigger combustion.
[110] Oxygen itself is not the fuel, but the oxidant. Combustion hazards also apply to compounds of oxygen with a high oxidative potential, such as
peroxides,
chlorates,
nitrates,
perchlorates, and
dichromates because they can donate oxygen to a fire.
..nothing in there but c02 and compost tea.. unless im missing the point here
---i get the smartpot design, And i know about the whole extra air thing
...but putting extra lines to pump pure 02 to the roots, doesnt seem feasible to me~ ..ill just stick to my SPs