It would help to know what you are trying to do with your sparger. Is it for agitation, is it for heat transfer, is it to disolve the gas into the liquid?
I have found a good supplier in Komax. They make inexpensive spargers that agitate if that is what you want. I have used them to sparge steam into water to heat up the water.
They have a very good web site, as well.
Let me know if I can be of further help.
Bob Sander Bob Sander
robert.sander@bpsolvaype.com