I've never had any luck getting DIY co2 to produce enough pressure to make this style of diffuser work. I've tried a couple different DIY set ups and several different recipes.
Originally Posted by Darkblade48
I used to use the cheap airstones as well (when I was using DIY CO2).
For the glass diffusers with the ceramic discs, DIY CO2 may not be able to produce enough pressure for the diffuser to work correctly.