Its amazing to see some folks giving the same pressure argument in every single thread when they havent even tried it themselves to see. I know they've never tried it because if they ever had they would know better.
I cant debate how much psi is inside a reactor, or how much it increases with something like a ball valve partially closed, because I dont know. But what I do know is adding resistance to the "other side" of anything flowing increases the pressure behind it. This is basic physics.
I once caused a Hydor canister filter to start leaking after turning a ball valve down too much. What was that if not too much back pressure?
Here's a guy fixing a cerges by increasing pressure using two filters instead of one, additional pressure is the primary factor
According to some folks it wouldnt matter how many filters this guy connected because as long as the other end is "open" there cant be much pressure...
How much additional pressure does it really take to squeeze out a tiny micro bubble of co2? The answer is not much.
Its an easy theory to test on any reactor that's putting out some mist. Just slap a ball valve after it partially closed down and see what a difference it makes.
The same folks like to counter this point by saying what makes the difference is increased dwell time as a result of slower rate of flow. This is another easy theory to test. Try restricting the flow both before and after the reactor on the same set up and see if there's any difference. The results should be the same both ways if its just a matter of dwell time.
Let me save you the trouble - they wont be.