CO2 Reactors

Please help!!!!!  I am running a DIY CO2 system via the yeast method.  My
problem is i can't get the CO2 to dissolve into the water at a quick enough
rate.  If any of you have built a DIY reactor could you PLEASE let me know
how you made it?

thank you,
Chris Simmons
Griff1324 at aol_com