Greg Dalton wrote:

Using Co2 tank and I can get some sort of slow bubbling with it but
anyone got a
cheap website or maybe a part from Lowe's that I can use for a needle
valve??


I don't use a needle valve, I use a flow restrictor that I made by
crushing a piece of 1/4" copper tubing with a hammer and anvil until it
will just barely pass any CO2. It's similar to the capillary tube used
to separate the high and low pressure sides in refrigeration. I adjust
the actual bubble rate by adjusting the pressure at the regulator. It
is *very* nonlinear; to increase the flow from 2 bubbles per second to
3, I might have to increase the regulator pressure by 10, and to get 4
bubbles per second might take 40 pounds.

Best regards,
Bob