Mel Laboratories, LLC- Science for Great Beer- quick to the point brewing science!

Kettle Souring with  Lactobacillus plantarum Kettle souring is one of the most approachable ways to make tart beers like Gose or Berliner Weisse, and  Lactobacillus plantarum  (Lp) has become a favorite tool for brewers. Unlike wild or mixed culture fermentation, kettle souring keeps the souring step separate — you sour the wort before the boil, then sterilize it, giving you full control over acidity while protecting against cross-contamination in your brewery.  L. plantarum  is particularly useful because it thrives at normal fermentation temperatures (around 85–95°F) and can drop wort pH into the 3.2–3.5 range within 24–48 hours. The process usually begins after the mash, when you run wort into the kettle, cool it down to Lp’s comfort zone, and inoculate. Brewers often purge oxygen with CO₂ and cover the kettle to protect the bacteria — Lp prefers low-oxygen conditions. The result is clean, lactic tartness without funky byproducts. Once the desired pH is reach...

Brewing a Gose: Salt, Minerals, and Balance A proper Gose starts long before the boil — it begins with the right water. Since this style depends on a delicate balance of tartness, salinity, and wheat-driven haze, your mash and sparge water are crucial. Adjustments with calcium chloride, gypsum, or magnesium sulfate help balance chloride-to-sulfate ratios and support yeast performance, while small additions of calcium hydroxide or baking soda can keep mash pH from dropping too far. While some brewers use acidulated malt for the style’s tartness, others prefer direct lactic acid additions or even kettle souring with Lactobacillus. Each method changes how the acidity integrates with the saltiness, so your choice depends on the profile you’re chasing. During the boil, minerals continue to play their role. Calcium chloride boosts malt smoothness and enhances mouthfeel, while gypsum can sharpen hop perception if you want a brighter edge to the tartness. The signature step in Gose brewing is ...

Sodium in Brewing Water Sodium can play an important role in beer flavor and mouthfeel. In moderate amounts, it enhances body and rounds out sweetness, helping certain styles feel smoother on the palate. But too much sodium quickly becomes unpleasant, giving the beer a salty or brackish taste that overwhelms malt and hop balance. Brewers typically aim for 10–70 ppm sodium, while keeping levels below 100 ppm to avoid harshness. If you need to boost sodium in your brewing water, the best tool is canning salt — pure sodium chloride without iodine or anti-caking agents that could cause haze or off flavors. A small addition of canning salt can adjust both sodium and chloride levels, often complementing malt character in malt-forward beers. On the flip side, if your tap water is already high in sodium, diluting with reverse osmosis or distilled water is the safest way to bring it back into range. Using the right salt in the right amount ensures your beer gains fullness without drifting into ...

Chlorine & Chloramine in Brewing Water One of the biggest hidden risks in using untreated tap water is the presence of chlorine and chloramine. Both are disinfectants added by municipalities to keep drinking water safe, but in brewing they can react with malt compounds to create  chlorophenols . These compounds are notorious for producing harsh, medicinal, “band-aid” like flavors that can ruin even the best recipe. Unlike minerals or mash pH, no amount of hops, malt, or fermentation finesse can mask chlorophenols once they’re there. The good news is removal is simple and inexpensive. A single Campden tablet (potassium metabisulfite) is enough to neutralize chlorine or chloramine in typical homebrew batch sizes — just crush and stir it into your brewing water, and within minutes the problem is solved. Alternatively, a good carbon filter can strip out chlorine effectively if you prefer a reusable option. Taking this step means you’re giving your yeast and your flavor profile a cl...

  The Importance of Hot and Cold Break Hot break happens during the boil when proteins, polyphenols, and other unwanted compounds coagulate and clump together. It looks like foam and “fluff” rising and falling in the kettle, but it’s doing real work—removing haze-forming proteins and excess nitrogen that could feed off-flavors later. A strong, rolling boil is essential here, since turbulence helps those proteins bind and drop out. Without a good hot break, wort clarity suffers, and beer stability takes a hit. Cold break is just as important, but it happens fast—when wort is chilled after the boil. Rapid cooling forces proteins, tannins, and lipids to crash out of suspension, leaving behind clearer wort and a better environment for yeast. A strong cold break reduces chill haze, prevents oxidation-prone compounds from lingering, and sets yeast up with a “cleaner canvas” for fermentation. The quicker the drop from boiling to pitching temperature, the stronger the cold break. There are...

Mash Temperature: The Enzyme Sweet Spot Mash temperature isn’t just about hitting a number—it’s about controlling which enzymes do the heavy lifting. Two key players are  beta-amylase  and  alpha-amylase , and each thrives in a different range. Beta-amylase works best on the cooler side, around 140–150°F (60–65°C), snipping starch chains into fermentable sugars like maltose. Alpha-amylase is happier warmer, around 154–162°F (68–72°C), breaking starch into bigger, less fermentable chunks. Where you set your mash temp determines which enzyme gets the upper hand. If you mash lower, you’re encouraging beta-amylase to create a more fermentable wort. The result is a cleaner, drier beer with a crisp finish—perfect for lagers, saisons, or IPAs where you want the yeast and hops to shine. But push your mash higher, and alpha-amylase leaves more unfermentable sugars in the wort. That builds body, mouthfeel, and a fuller impression of sweetness, which works beautifully in stouts, por...

Dialing in Sparge Water pH and Temperature A lot of brewers focus on mash pH, but sparge water can make or break your final wort. If the sparge water is too hot or the pH creeps too high, you risk extracting tannins and silicates from the grain husks. The result? Astringency, bitterness, and that “drying” flavor nobody wants in their beer. Keeping sparge water at the right temperature—around 168–170°F—and holding the pH below 6.0 ensures you’re rinsing sugars, not harsh compounds. The right sparge adjustment is also about consistency. Acidifying sparge water when needed with lactic acid or phosphoric acid protects the flavor while still maximizing efficiency. It’s a small detail, but one that separates clean, well-balanced beer from one that feels rough around the edges. Pay attention to sparge water, and you’ll get more predictable mash efficiency, smoother wort, and beer that finishes as crisp and clean as you intended. Want your brewing water tested? Curious about your water for bre...

ZOFAN: The Key to Yeast Life Management Every brewer knows fermentation makes or breaks the beer, but few think about what yeast actually  needs  to thrive beyond sugar. That’s where ZOFAN comes in—Zinc, Oxygen, and Free Amino Nitrogen (FAN). Together, these three resources are the foundation for strong yeast cell walls, clean budding, and the ability to reuse yeast across many generations. If you care about healthy fermentations, ZOFAN should be at the front of your mind. Zinc is often missing in today’s highly modified malts, but it’s critical for enzyme function and yeast reproduction. A small addition at the end of the boil helps build durable cell walls and ensures budding cells form correctly. Oxygen, on the other hand, is essential during the lag phase. It allows yeast to synthesize sterols and unsaturated fatty acids—basically the building blocks for flexible, resilient membranes. And then there’s Free Amino Nitrogen (FAN), supplied by both the wort and supplements lik...

Custom Packets for Every Brew Day Whether you’ve tested your own water or just know you’re starting from reverse osmosis or distilled, our packets take the guesswork out of brewing chemistry. Each mash and sparge treatment is built from the same salts pro brewers use—gypsum, calcium chloride, calcium hydroxide, magnesium sulfate, canning salt, and baking soda—measured for your exact batch size. No scales, no spreadsheets, just a ready-to-use blend that helps you hit the right chloride, sulfate, and calcium balance for better mash performance and flavor. We also go beyond mash water. Brewing a hazy? Our NEIPA end-of-boil packet shifts the profile toward a chloride-rich balance without hurting mash efficiency. Looking for healthy fermentation? Our last-15-minutes packet delivers zinc, DAP, and Whirlfloc—giving yeast the nutrients it needs while clearing your wort. From mash efficiency to yeast vitality, a single packet can take the stress out of brew day and help your beer turn out the w...

Boosting Your Boil: Zinc, DAP, and Whirlfloc The last 15 minutes of the boil is prime time to set your beer up for success. Adding a small dose of zinc gives yeast the trace mineral it needs for strong fermentation and healthy cell walls—something that’s often missing from modern, highly refined malt. At the same time, diammonium phosphate (DAP) provides a nitrogen kick, ensuring yeast has enough nutrient to fully finish the job without stalling. Whirlfloc belongs in that same window too. Dropping it in near the end of the boil helps coagulate proteins and polyphenols so they fall out during the whirlpool. That means clearer wort going into the fermenter, a smoother fermentation ahead, and fewer headaches later when you’re packaging. Three quick additions, all in the last 15 minutes, make a noticeable difference in fermentation performance and final beer quality.   Want your brewing water tested? Curious about your water for brewing?   We offer easy testing for minerals, pH, a...

Do You Know Where Your Water Comes From? When it comes to brewing—or even just understanding your tap water—it helps to know whether your supply comes from  groundwater  or  surface water . Groundwater is drawn from aquifers deep below the earth’s surface, where it has been filtered naturally through layers of soil, sand, and rock. This slow filtering process removes many organic compounds but dissolves minerals along the way. As a result, groundwater often contains higher levels of calcium, magnesium, and other dissolved solids, giving it a “harder” character. Surface water, on the other hand, comes from rivers, lakes, and reservoirs. Because it’s exposed to the environment, it typically contains more  organic material —think leaves, algae, or other natural matter—and fewer dissolved minerals compared to groundwater. Treatment plants can clean and balance these waters for drinking, but brewers should keep in mind that surface water may be softer yet more variable se...

Why We Test Brewing Water When we test brewing water, we’re not just checking numbers on a chart—we’re identifying the factors that directly influence mash performance, yeast health, and beer flavor. By measuring chloride and sulfate, we can predict how the water will shape the malt versus hop character in your beer. Total alkalinity, bicarbonate, and residual alkalinity show us how resistant your water is to pH change, which is critical for keeping mash enzymes active in that 5.2–5.4 range. Hardness levels—both total, calcium, and magnesium—tell us how well your mash will convert starches and how the yeast will behave during fermentation. Sodium content adds to mouthfeel in moderation but can become harsh if too high. Finally, pH testing gives us the immediate baseline we need to adjust the mash toward optimal enzyme activity. By looking at all of these together, we can design water treatments that make your brewing process smoother and your beer more consistent. Want your brewing wat...

The Dreaded Mash pH When it comes to brewing, water is far more than just the base of your beer—it’s the foundation of your mash chemistry. The mineral content of your brewing water plays a key role in how well your grains interact with enzymes during the mash. Calcium, magnesium, chloride, and sulfate all contribute to how the mash behaves, from enzyme efficiency to yeast performance later on. By adjusting these minerals thoughtfully, you can create the right environment for your grains and hops, while guiding your beer’s flavor profile in the direction you want. One of the most important goals during mashing is to keep your mash pH in that sweet spot of 5.2–5.4. At this range, the enzymes alpha-amylase and beta-amylase are most active, breaking down starches into fermentable sugars efficiently. The malt will naturally pull pH downward, but often not quite enough—especially if your water is alkaline. That’s where mineral adjustments and sometimes acid additions come in. With the right...

  The Notorious NEIPA Water Treatment The New England IPA (NEIPA), emerged in the early 2010s as a response to the increasingly hop-forward West Coast IPAs, offering a smoother, juicier, and hazier alternative. Pioneered by breweries like The Alchemist and Tree House, NEIPAs became known for their soft mouthfeel, juicy hop character, and appearance with a cloudy haze. This haze comes from a combination of high-protein grains, such as oats and wheat, and careful dry-hopping techniques. The water profile in NEIPA plays a significant role in the overall experience, especially the balance of brewing salts like chloride, sulfate, and calcium. Higher chloride levels (200 ppm) accentuate the smooth, fuller mouthfeel, contributing to the beer’s roundness and softness. Lower sulfate levels (75 ppm) ensure that the beer's bitterness remains subdued, allowing the juicy, fruity hop flavors to shine through without a harsh finish. Maintaining calcium levels under 150 ppm helps stabilize the bee...

Why Homebrewers Should Test Their Water More Often As homebrewers, we all know that great beer starts with great water—but what many brewers overlook is how often that water can change. Depending on the season, your local water department might switch between different aquifers, reservoirs, or groundwater sources to meet demand. Each source can have its own unique mineral profile, which can dramatically affect the taste, clarity, and fermentation of your brew. Even if you're using well water, shifts in groundwater from rainfall, runoff, or nearby activity can alter its composition. That perfect IPA recipe you dialed in last spring might not come out the same in the fall if your water has changed. Regular water testing isn’t just about safety—it’s about consistency and control. Knowing what’s in your water gives you the power to make the right adjustments with salts or filtration, and ensures every batch comes out just the way you intended. Want your brewing water tested? See our bl...

  Chloride vs. Sulfate; Short Burst Hot Break Fast reads. Big flavor. The  chloride-to-sulfate ratio  plays a big role in how your beer tastes and feels. It doesn’t change the flavor directly — it shapes the perception. Think of it as a balance dial between  maltiness  and  bitterness . Chloride  boosts  body, sweetness, and roundness . Sulfate  enhances  hop bitterness, dryness, and crispness . A  1:1 ratio  gives you balance. Push toward  2:1 chloride  for smooth, malt-forward styles like porters, ambers, or hazy beers. Go  2:1 sulfate  for West Coast IPAs and hop-forward pale ales. Too much of either can cause problems — high sulfate can taste sharp and harsh; too much chloride can make the beer feel heavy or dull. Start small, test often. Use  gypsum (CaSO₄)  to add sulfate, and  calcium chloride (CaCl₂)  for chloride. Always account for your base water profile first. Want your brewin...

In the realm of brewing, every creation is a labor of love, an exquisite dance of art and science. Today, I want to share with you the story of a romance that blossomed within the frothy world of beer, a tale of a captivating American Light Lager that I recently brewed that captured hearts and palates alike. As the golden elixir cascades into the glass, a myriad of emotions swirl within me. The first glance reveals a liquid gem, shimmering with a radiant clarity that hints at the meticulous craftsmanship behind its creation. Its pale amber hue, reminiscent of the warm embrace of a setting sun, draws me closer, eliciting a sense of tranquility and anticipation. With every breath, the tantalizing aroma of this American Light Lager weaves an enchanting tapestry of scents. Delicate notes of freshly harvested grains dance gracefully with a touch of honey, inviting me to explore further. The gentle caress of floral hops intermingles with whispers of citrus, awakening memories of sun-drenched...