Why Brewing Water Decides a Beer

Water is more than 90% of what's in the glass

A finished lager is roughly 90–95% water by weight. Malt, hops and yeast get the credit, but the liquid carrying them is the largest single ingredient — and it is never just H₂O. Source water arrives with dissolved minerals picked up from the rock and soil it passed through, and those ions do real chemical work the moment the mash begins.

Brewers used to be stuck with whatever came out of the local well, which is exactly why beer styles grew up tied to specific cities. Today most large breweries can strip water back to near-zero minerals and rebuild a target profile by the gram. That makes the starting water less of a hard limit than it once was — but a clean, soft source is still a head start, because you are adding salts to plain water instead of fighting to remove what you don't want.

What each mineral actually does in the mash and the glass

Six ions carry most of the weight. None of them flavour the beer the way a hop does; they shape the conditions under which everything else happens — mash pH, how bitterness reads on the palate, how full the body feels, how bright the beer drops clear.

The single most useful number a brewer watches is the sulfate-to-chloride ratio. Tilt it toward sulfate (say 2:1 or higher) and bitterness reads dry and assertive — the right call for a hoppy pale ale. Tilt it toward chloride and the same beer drinks rounder and maltier. Same hops, same bittering units; the water decides how they land on the tongue.

Bicarbonate is the ion that trips people up. It is fine, even helpful, when dark roasted malts are there to acidify the mash against it. Put it under a pale grain bill and there is nothing to balance it: pH stays too high, hop bitterness turns coarse, and the beer never quite drops bright.

Three cities whose water built three styles

The classic beer styles are, in large part, fingerprints of local geology. Three examples are worth knowing because brewers still reach for them as reference points.

Pilsen, Czech Republic. Exceptionally soft water — very low in nearly every mineral, often single-digit ppm across the board. That blank canvas is why the original Pilsner Urquell of 1842 could show such a clean, delicate malt-and-hop balance: there were no carbonates to coarsen the bitterness and nothing to get in the way of a pale, golden lager. Soft water and pale lager go together for a reason.

Burton-on-Trent, England. The opposite extreme — groundwater loaded with sulfate, historically several hundred ppm and rich in calcium from the local gypsum. That sulfate gives Burton pale ales their famously crisp, dry, almost mineral bitterness. The effect was prized enough that brewers elsewhere began "Burtonising" their water — deliberately adding gypsum to chase the same snap. The technique is still named after the town.

Dublin, Ireland. High-carbonate water with substantial bicarbonate. That profile is a liability for a pale beer but an asset for a dark one: the heavily roasted barley in a dry stout acidifies the mash, balancing the carbonate that would otherwise wreck the pH. The water and the dark grain bill solve each other's problems — which is a large part of why dry stout took root there.

Why a soft, clean source like Qiandao Lake is a real head start

Cheerday has brewed on the banks of Qiandao Lake in Chun'an, Hangzhou, since 1985. The practical value of soft source water is straightforward: you are building a beer's mineral profile up from a low baseline rather than treating water down from a high one. Low background carbonate means pale lagers stay clean and the bitterness stays smooth without aggressive correction. Where a brewer needs sulfate for a crisp pale ale or a touch more chloride for a rounder malt-driven beer, those salts can be added in measured amounts — addition is far easier to control than removal.

This is the same logic the Pilsen brewers had handed to them by geology, except it is repeatable across a range of styles. It is why "Original Ecological" brewing on a clean lake source is more than a label — it is a starting position that makes the rest of the process easier to get right. The longer story of the lake and the brewery is on our heritage page.

What "pure draft" really is — and how it differs from the bottle you know

"Pure draft" — 原浆, literally "original mash/liquid" — is beer served much closer to how it leaves the fermenter. Most beer you buy is bright beer: it has been filtered to strip out yeast and haze, then usually pasteurised so it survives months on a shelf. Both steps trade away freshness for stability and a polished, transparent pour.

Pure draft skips most of that. It is left unfiltered — or only lightly filtered — so live yeast stays in suspension, and it is often unpasteurised. What you gain is real and tastable:

• Fuller body and mouthfeel. Yeast and the compounds normally filtered out carry weight and texture; the beer drinks softer and rounder.
• Fresher aromatics. Hop and fermentation aromas are at their peak straight out of the tank and fade with time and processing. Pure draft catches them early.
• A faint natural haze. Yeast in suspension means it won't be crystal-clear, and it shouldn't be — that cloudiness is the point, not a fault.
• A short shelf life. Live yeast and no pasteurisation mean the clock is running. This is fresh-format beer, meant to be drunk soon, not stockpiled.

Cheerday's flagship Easy-Pull Craft Pure Draft (易拉盖精酿原浆) is the worked example — 420 mL, ≥3.6% alc./vol., brewed to a 9°P wort gravity with Qiandao Lake water. The easy-pull lid is not a gimmick: a fresh-format beer wants to be opened and poured quickly, and the format is built around drinking it close to source while the yeast and aromatics are still lively.

How to handle and taste pure draft so it shows its best

Because the yeast is alive and the beer isn't pasteurised, freshness handling is the whole game. Keep it cold from the brewery to the glass — warmth speeds yeast activity and ages the beer fast. Treat the printed date as a real deadline, not a suggestion, and sell or drink it early in its window rather than late.

When you pour, decide what you want. Pour gently and leave the last finger of liquid in the can to keep most of the yeast behind for a cleaner glass; or swirl the final pour to rouse the yeast back in for full body and a deliberate haze. Serve it cool but not ice-cold — a few degrees of warmth lets the malt and hop aromatics open up that filtered, pasteurised beer has largely lost. Drink a pure draft fresh and you are tasting beer about as close to the fermenter as a customer ever gets.