Editing Openai/6939a858-8b8c-8006-b827-ae43c13df6f8 (section)

=== Assistant: Still not a problem. ===
Still not a problem.

Why:
* CO₂ lines only see dry gas, not beer.
* Contaminants (Acetobacter, Brett, LAB) cannot travel upstream through gas posts under pressure.
* Check valves in regulators/manifolds add another barrier.

When it ''could'' be an issue (edge cases):
* Beer backed up into gas lines (overfilled keg + no check valve)
* Shared spunding line with liquid present
* Wild pressure swings causing liquid carryover

Quick sanity check
* Disconnect gas QD → if it’s dry and doesn’t smell sour, you’re fine.
* If paranoid: spray some starsan into the gas QD, reconnect.

Bottom line
* Shared CO₂ manifold = safe
* No keezer contamination risk
* Drink it sooner rather than later

If you want, describe the pellicle (thin skin vs chunky islands) and I can ID the likely culprit.