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CO2 Diffuser

I bought a Aqua-Medic Membrane CO2 Diffuser from
pets.com (imported by Red Sea). It is from the same company
that makes the Ceomat.

It works on very low pressure, 1-2 PSI.
The instructions say that the CO2 diffuses through the
membrane, and not through bubbles. Bubbles do occasionally
escape, but it says it is because of other gas impurities in the CO2
If the pressure is higher than 1-2 PSI, alot of big bubbles escape.

It seems that it is working, compared to a Eheim diffuser at 12 PSI.

Does anybody else have experience with this diffuser?