Stick some tubing of the gas dip tube.
Is Picobrew Zymatic a low oxygen brewing system? Would it be with a stainless wort chiller and SMB tablets added to the mash water?
Nope, it's not because it returns wort to the keg via the gas in, so it splashes.
I haven't tried it, but I'm sure a liquid tube could be swapped in as well. I imagine it would work best if the inlet and outlets were moved away from one another.
Edit to add - would the steam created in the keg be sufficient to purge the oxygen?
Comments on the Z:
1) I would try and float the end of the attached tube (a la the Blichman Easy Sparge floatie) to prevent pressure on the Z's tiny little pump.
2) Or maybe I'd just put a 3 gallon dip tube into the gas post (if it fits) and run with it since the liquid level is typically around 3ish gallons while the system is running.
3) If I was to try this procedure on the Z, I would bring the whole system to boil with the lid off. Boil for 15'. Then let it chill in an ice bath down to initial mash rest, add the Campden, have it dough in, mash out, add FWHs and 60' hops, then proceed as normal (boil off is <4% already). The Z still fills from the top of the mash, but at least the thing is covered and no oxygen is introduced in sparging since there is no sparge. The anecdotal evidence of a "DO mash is far less aromatic" is something I experience anyway on the Z, so I would have to not smell the mash within 3-5' of the machine to get an improvement in that regard.
4) But I probably won't, because I'm happy enough with the freshness in my beers. And I think that final beer pH has more of a role in beer stability than DO anyway, so I'm busy worrying about that right now.
The thing that I don't understand about this white paper is that there is a lot of "we recommend" with no reasoning or explanation. I get that the main point here is DO, and it does an alright job of explaining the role of DO without the data (which I'd like to see because of bullet #1 below, but we likely won't
), but there are other things that receive no mention of backup at all.
- What happens if I only follow parts of the procedure because of my equipment limitations? What parts are the most important?
- Why pitch at 5-6*C? (What's wrong with 8-9*C?)
- Why the hate for W34/70? (I don't like it too much either on first pitch, but why?)
- Why those lengths and temps for the Hochkurz? (Where there others attempted? What happened?)
- Why add 30% of the hops as FWH? (What does that gain me, specifically, over a 60' and 15'?)