Hi! This is Dave Carpenter, author of the Unreal Ale article. Feel free to send any questions my way! I'm not on these forums too frequently, but I'll do my best to respond as promptly as I can. I'm currently on a brewery tour in OR and WA, so I'll only have intermittent connectivity until Aug 8.
One reader sent me the following question via e-mail:What about the degradation of the membrane in the propane regulator? CO2 is much more corrosive than propane. Is there any advantage to using the propane regulator over just setting a CO2 regulator to zero (effectively making it a demand valve)?
To which I replied:I hadn't considered membrane degradation in the LP regulator at all. I think I paid $10 or $15 for it, so if it lasts a couple of years or more, that's okay by me. If it only lasts a couple of batches, though, that's not good. I only have three data points at the moment, so I'll have to see how it behaves when I dig it out for the winter. I hadn't tried just setting the CO2 regulator to zero. I suspect that would work just fine, but I have no evidence to support that suspicion.
I can take a video, but it won't be until October at the earliest. I don't use temperature control for serving my real ales, so I have to wait until the house cools down enough to do it properly.
I'm happy to answer any other questions, so fire away. Cheers!