A beautiful stainless cylinder can arrive at your brewery, pass a visual inspection, and still damage every batch it touches. The difference lies in details that most sales brochures ignore. Here are the real questions that experienced brewers ask Google – and the answers that separate professional equipment from decorative metal.

Question: “Why does my fermenter take 4 hours to cool from 20°C to 2°C?”

Slow cooling stresses yeast, prolongs diacetyl rest, and wastes glycol. The culprit is usually undersized or poorly zoned cooling jackets. A professional fermenter has:

At least two independent cooling zones (cone + cylinder)

Jacket surface area covering ≥ 40% of the cone (where yeast settles and activity is highest)

Dimpled or pressed plate design for turbulent coolant flow – not just a welded-on shell.

We calculate cooling time based on your groundwater temperature and cellar air, then guarantee 2°C per hour gradient from core to setpoint. No guesswork.

Question: “What causes that white film inside my tank after CIP?”

That film is often residual caustic or beer stone trapped in micro-crevices. It happens when internal welds are not ground to Ra ≤ 0.6 µm and electropolished. Our tanks undergo borescope inspection of every weld seam – and we send you the video. If you see any shadow, scratch, or discoloration, we rework the tank before shipping.

Question: “Can I use the same fermenter for ale, lager, and sour beer?”

Yes – but only if the internal surface is truly passive (properly passivated 316L) and the pressure relief valve is adjustable from 0.5 to 2.5 bar. Sour beers require higher acidity tolerance, so we specify a slightly thicker wall (2.5mm for <20hL, 3mm for larger) and use EPDM gaskets that resist acid degradation.

Question: “What is the ideal cone angle for yeast harvesting?”

60° to 70° . Shallower angles trap yeast and trub; steeper angles increase tank height unnecessarily. At 65°, you get clean yeast cropping after just two days of settling – ideal for repitching.

What a fermentation engineer wishes they had asked

“Show me your weld penetration test report for the manway ferrule.”

“Do you use automatic back-purging during welding?”

“Can I replace the CIP spray ball without entering the tank?” (Yes: we use removable spray balls with triclamp access).

Your yeast deserves better than “standard”
Do not accept a fermenter that was designed for a price point. Accept one designed for a 15-year service life, 500+ batches, and consistent yeast vitality.

→ Message us your desired tank volume (10hL, 20hL, 50hL, etc.) and which beer styles you brew most. We will send a fermenter specification sheet that compares our internal finish and cooling performance to three leading suppliers.