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This is one of the most common questions we hear from production managers six to twelve months after commissioning a new system. The brewhouse that delivered 92% efficiency on day one is now struggling to hit 87%. The recipe hasn't changed. The malt is the same. Yet the numbers tell a different story.

The culprit is rarely obvious

Most brewers look first at the mill—gap settings, roller wear, grain conditioning. These matter, but they are not the primary source of gradual efficiency loss. The real thieves are more subtle: heat exchanger fouling, mash tun false bottom blinding, and lauter rake misalignment from thermal cycling.

Question: “How does heat exchanger fouling affect my efficiency?”

A plate heat exchanger that accumulates even 0.5mm of protein and hop residue loses 15–20% of its thermal transfer capacity. The wort takes longer to cool, which means longer knock-out times, which means your brewhouse sits idle while the fermenter waits. But more critically: fouling creates temperature gradients in the fermenter—the first 500 litres cool faster than the last 500, stressing yeast and reducing attenuation. The efficiency loss compounds.

The engineering solution is not just more frequent CIP. It is designing the heat exchanger with oversize plates and a reverse-flow capability that allows you to back-flush during CIP without disassembling the unit. Our systems include a dedicated CIP loop for the heat exchanger, with flow meters that track pressure drop across the plates. When the differential pressure exceeds a preset threshold, the system alerts you—before efficiency suffers.

Question: “What about the false bottom—does it wear out?”

Yes, but not in the way you might think. The stainless steel itself does not degrade, but the slots can become compressed or distorted from repeated thermal expansion and the weight of wet grain. A false bottom that was perfectly flat at installation can develop a slight crown after 200 batches. That crown allows fine particles to bypass the filter bed, increasing turbidity and reducing extract.

We fabricate our false bottoms from thicker-gauge 316L and use a reinforced support structure that maintains flatness even under full grist load. We also specify wedge-wire screens rather than perforated plates—they are more resistant to blinding and easier to clean.

Question: “Is rake misalignment really a problem?”

A lauter rake that is off-centre by even 5mm creates uneven bed depth—deeper on one side, shallower on the other. The shallow side drains too fast, the deep side too slow. You compensate by extending the runoff time, which increases the risk of tannin extraction and reduces your brewhouse throughput.

Our rakes are mounted on a self-centring shaft with precision bearings, and we include visual alignment marks on the manway so operators can verify centering during each cleaning cycle. It sounds simple. It is engineering discipline.

Efficiency is not a one-time achievement

It is a maintenance discipline. The best brewhouse in the world will drift if the supporting systems are not designed for long-term stability. We build for the 500th batch, not just the first.

→ Tell us your current brewhouse efficiency and how many batches you have run. Our process engineers will send a diagnostic checklist—free, no commitment—that helps you identify where your system is losing extract.