Latest / The Operator's Manual with Fexingo: Daily Decisions, Tactical Wins, and Business Execution / How One Brewery Cut Beer Waste 90 Percent With a Float
Transcript
- Lucas: So there's a number I want to start with: four percent. That's how much beer a typical mid-sized brewery loses every year. Not to spillage, not to bad batches — just to yeast and foam sticking to the inside of the tank. Luna: Four percent doesn't sound huge until you do the math on a brewery making fifty thousand barrels a year. That's two thousand barrels just... gone. Lucas: Exactly. Two thousand barrels is roughly sixty two thousand gallons. At maybe five dollars a pint wholesale, that's close to a million dollars a year vanishing into tank walls. And most brewers just accept it as the cost of doing business. Luna: But one brewery didn't accept it. Which one? Lucas: A craft brewery in Wisconsin — I'll keep the name out of it, but they're doing about forty thousand barrels a year. They decided to attack that four percent with something that costs less than two hundred dollars and looks like a kid's bath toy. Luna: A bath toy? Okay, I need to hear this. Lucas: It's a plastic float, roughly the size of a grapefruit, that sits inside the fermentation tank. The idea comes from a simple observation: most of the beer lost to the tank walls is actually trapped in the foam that forms during fermentation. That foam clings to the sides, and when the tank is emptied, a lot of it stays put. Luna: So the float breaks the surface tension? Lucas: That's the core of it. The float bobs on the surface of the beer as the tank fills and empties. As the level drops, the float rolls down the wall, and in doing so, it pushes the foam back into the liquid. It's a mechanical disruptor. No electronics, no moving parts beyond the float itself. Luna: And that cut their losses from four percent to...? Lucas: Under half a percent. They went from four percent loss down to zero point four percent. That's a ninety percent reduction in beer lost to tank walls. Luna: Ninety percent. Let me just—that's the kind of number you'd expect from a massive investment in automation, not a two hundred dollar float. Lucas: Right. And that's the part I find genuinely interesting. The brewery had already spent a quarter of a million dollars on a fancy automated cleaning system a few years back. It helped with sanitation, sure, but it did nothing for the foam problem. The float solved it for less than the cost of a few cases of hops. Luna: So why did it take so long to figure out? I mean, the physics of foam clinging to walls isn't new. Lucas: I think it's because the problem is so visible that people stop seeing it. Every brewer knows foam sticks to the tank. It's just part of the process. And the typical response is to throw more energy at it — more cleaning cycles, more chemicals, maybe a different tank coating. Nobody steps back and asks: what if the foam just wasn't there to begin with? Luna: It's a classic reframing. Instead of trying to clean the foam off, stop it from sticking in the first place. Lucas: Exactly. And the beauty of the float is that it does this passively, throughout the entire fermentation cycle. It's not a one-time intervention; it's continuously disrupting the foam as it forms. Luna: So they just dropped a float in every tank and watched the numbers improve? Lucas: Almost. There was some iteration. The first float they tried was a solid sphere, and it worked, but it tended to spin and create a little vortex. So they switched to a slightly textured surface, and that solved it. Then they had to figure out how to keep it from getting stuck when the tank was empty — they added a small tether to the manway. Nothing complicated, just a few weeks of trial and error. Luna: And the payback period? You mentioned it's quick. Lucas: Eleven days. The float costs about a hundred and eighty dollars, and the brewery is saving roughly fifteen thousand dollars a month in lost beer. So it paid for itself in under two weeks. That's a return on investment that would make any CFO's eyes water. Luna: Fifteen thousand a month just from not leaving beer on the walls. That's wild. Lucas: And it's not just the money. There's a sustainability angle too. Less beer wasted means less water and energy used to produce it. The brewery calculates they're saving about a million gallons of water a year, just because they don't have to brew as much replacement beer. Luna: Okay, so this is a great story for a brewery. But what's the broader lesson for the rest of us who don't ferment things for a living? Lucas: The broader lesson is about where we look for waste. A lot of operational improvements focus on the big, visible processes — the line speed, the changeover time, the throughput. But some of the biggest wins are hiding in the margins, in the stuff that everyone takes for granted. Like foam on a tank wall. Luna: So it's about questioning the assumptions that are so baked in you don't even see them. Lucas: Right. And often the simplest solutions are the ones that get overlooked. We're so conditioned to think that big problems need big, expensive, high-tech answers. But sometimes a plastic float is the answer. Luna: It's almost embarrassing how simple that is. I mean, I'd love to see a whole panel of engineers try to solve that problem with sensors and machine learning, and then a brewer walks in with a float from a hardware store. Lucas: And that's actually a great segue to something I wanted to mention. We get a lot of listener questions about how we keep making this show, especially since we don't run ads. And the honest answer is that it's listener-supported. A small group of you chip in a few dollars a month through buy me a coffee dot com slash fexingo, and that literally covers the costs of producing all two hundred plus episodes. It's not a big operation — it's just enough to keep the lights on and the microphones plugged in. Luna: And we're genuinely grateful for that. It's what lets us spend the time on stories like this one, digging into the details instead of just skimming the surface. Lucas: Yeah. So if you've ever gotten something useful out of these conversations, that's one small way to give back. No pressure, though. We're just glad you're listening. Luna: Alright, back to the float. You mentioned they tried a few iterations. What did the final version actually look like? Lucas: It's a textured, food-grade polypropylene sphere, about six inches in diameter. It floats on the surface of the beer, and as the tank drains, it follows the level down, constantly breaking the foam's contact with the wall. The tether keeps it from getting lost when the tank is empty. That's it. Luna: And they just drop it in before fermentation starts? Lucas: Yes, through the manway at the top. It's in place for the whole cycle, and then they pull it out when the tank is cleaned. It takes about ten seconds to install. Luna: So it's not a big process change. It's just one small object sitting in the tank doing its job. Lucas: And that's what makes it such a great example. The change is so small that it almost doesn't feel like a decision. But the impact is massive. It's the definition of a low-friction improvement. Luna: Have other breweries started copying this? I'd imagine the word spreads fast. Lucas: It is spreading, but slowly. There's actually a patent on the idea — a small company called BrewFlo sells a version of it, and I think a few larger breweries have tested it. But adoption is nowhere near universal, which is surprising given the ROI. Luna: Why do you think that is? If the numbers are that clear, why wouldn't every brewery be doing this? Lucas: I think it's a mix of inertia and skepticism. Brewers are often wary of anything that touches the beer — they worry about contamination, about off-flavors, about the float getting stuck. Even though the evidence is right there, it takes time to overcome that instinct. Luna: So it's a change management problem as much as a technical one. Lucas: Exactly. And that's true in any industry. You can have the perfect solution, but if people don't trust it, it won't get adopted. The brewery in Wisconsin had to do blind taste tests to prove the float didn't affect the beer's quality. They had to show that the beer from floated tanks tasted identical to beer from regular tanks. That was the key to getting their own team on board. Luna: And once the team saw the numbers and tasted the proof, they were sold. Lucas: Right. And now they're expanding the idea to other parts of the process. They're looking at using floats in their bright tanks, and even in their wastewater treatment — where foam is also a problem. The same principle applies. Luna: So it's not just about beer. Anywhere you have foam and a tank, a float could help. Lucas: That's the takeaway. Whether it's a chemical reactor, a food processing vat, or a fermentation tank, the physics is the same. And the fix is so simple it almost seems silly. But silly fixes can be the best ones. Luna: I love that. I'm going to start looking for foam problems in my own life. Lucas: Just don't drop a float in your coffee. That might be a step too far. Luna: Fair point. So next time you're in a brewery, maybe ask them about their float game. Lucas: Definitely. It's the kind of question that makes a brewer light up. And who knows, you might save them a million dollars.