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It never made sense till your explanation. I never considered co2 absorption and pressure effects. So now, I can just disconnect the closed spunding/blow-off tubing and rest assured that o2 is not somehow creeping back into the pressurized fermentor. Learn something everyday! Thanks!

I spund @ 8lbs and capture fermentation co2 in the keg > Starsan bath. Post fermentation, I remove keg, re-route blow-off tubing straight to Starsan well, CLOSE completely the Blichmann spunding valve and connect co2 tank to gas fitting (set to 5psi) for the DH/rest. During that time, Starsan...

Yes, it seems impossible but it happens. No pictures but this is my setup... Spike CF-5 fermentor with Blichmann Spunding valve https://www.blichmannengineering.com/product/tri-clamp-spunding-valve/?sync-done that sits on top of a hop bong and a butterfly valve under that. The blow-off tube...

I get suck-back with 5 lbs. co2 pressure in the fermenter (even after temperature stabilization). Never been able to figure out why.

1/4" thin walled tubing... https://www.amazon.com/gp/product/B07W5TGX8B/ref=ox_sc_saved_title_7?smid=A13YYJYWLZVHOX&th=1

This is what I do now... hoist the Wilser bag and hang it over a brew bucket until no more drips, then dump the captured wort into the kettle. I'm done with bag squeezing... happy to drop that small but slightly tedious step from my brew day regime.

I use a 10 gallon (MegaPot) BIAB system. Most of my brews have an upper end ABV of 6.5-6.8%, full volume mash (no sparge), 5.25-5.5 gallons into the fermenter and 70% BH efficiency. Never had an overflow issue... usually have a couple of inches of headroom to spare. If you plan to brew much...

It's a nice product.

I attach the co2 cylinder to the fermenter after the pressure fermentation is complete to maintain positive pressure in the fermenter for cold crashing and keging.

I set the SV to 10psi and off-gas the excess pressure during fermentation through an empty keg to capture the co2, and from there to a container filled with Starsan. Once fermentation is complete, I disconnect the purged keg, connect the co2 cylinder to the fermenter, and drop the blowoff...

There is a slight difference between the spunding valve gauge and my co2 regulator gauge. I set the SV @ 10psi and the regulator gauge reads 8psi... probably a built-in safety protocol but it shouldn't have any bearing on what's happening here. I have no gas leaks anywhere or I'd notice a loss...

Thanks for your thoughts... I know, crazy. The pressure gauge hasn't moved at all. I have my co2 cylinder connected at 10psi and I maintain a constant beer temp using my temperature controlled cooling coil/glycol chiller. FYI, I just checked again... in the past 2 hours since pushing the...

Yes, direct connection.

Thanks for the reply. I like this line of thinking but there is currently no active fermentation (bubbling) so no movement of the gas inside the tubing. I would therefore think that the tubing/gas temps are stable to the environment outside the fermenter regardless of the temp inside the...

I ferment under 10psi in my Spike CF-5 using the Blichmann Spunding Valve. Once FG is reached, my blow-off tube starts to suck the Starsan slowly up the tubing toward the pressure gauge. I have my co2 tank connected at 10psi and I can confirm positive pressure by loosening the pressure...

Do you all find a significant impact/improvement on the final product using these mash caps?

I'm curious Bobby... what is your full volume, no sparge BH efficiency?

This is my second stir-plate (first one was too small, plastic and generally poorly constructed). I've been very happy with it... and BTW, a great company for your all of your brewing needs. https://www.brewhardware.com/product_p/stirplatenoreaster.htm

I like this beer... anyone have an updated recipe?

Put a shorter probe in, if possible, and be careful when stirring/hoisting. Bobby M's (Brewhardware) BIAB packages are ideal as the thermometer probe is located below the false bottom, separated from the bag.