Originally Posted by KH2PO4
From what people describe as "dump". It's like a jet of CO2 being dumped quickly.
My Azoo doesn't behave like that. When the tank pressure gradually drops,
the working pressure rises, the bubble rate slowly increases. During that time
I have to adjust the needle valve once every a few days until the tank is
I believe such difference in behavior can be caused by differences in regulator design. More precisely, adjustable single-stage regulators are usually implemented differently from non-adjustable single-stage ones.
An adjustable single-stage regulator is typically implemented around a flexible membrane (AKA diaphragm), as shown in this picture (see the sticky in this forum)
Meanwhile, non-adjustable regulators often don't have any membrane at all. They are built around a "piston" instead, as can be seen in this picture
This is actually my non-adjustable AquaticLife regulator. I believe non-adjustable Azoo is actually the same thing inside.
The difference in internal mechanics of these regulators can easily lead to different end-of-tank behavior.
Although I have to admit I don't remember seeing that gradual ramp-up behavior from my AquaticLife. But I don't let it run for too long once the input pressure begins to drop either...