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The 95% Rule

Beer is roughly 90-95% water. Every ion dissolved in that water affects enzyme activity during mashing, yeast health during fermentation, hop perception in the finished product, and the overall mouthfeel and drinkability of the beer.

The great brewing cities of history — Pilsen, Burton-on-Trent, Munich, Dublin — became famous for specific beer styles largely because of their local water chemistry. Pilsner was born in Pilsen because the local water is incredibly soft. Burton's high sulfate water made pale ales bright and hop-forward. Munich's carbonate-rich water was perfect for dark lagers.

But here is the reality for modern craft brewers: you do not have to accept whatever comes out of the tap.

With a commercial reverse osmosis (RO) system, any brewery can start with a nearly blank canvas — water stripped of virtually all dissolved minerals — and build the exact water profile needed for any beer style. This is why RO systems have become standard equipment in craft breweries from San Diego to Portland to Asheville.

The Ions That Matter

Six ions dominate brewing water chemistry. Understanding what each one does is the foundation for building any water profile.

Calcium (Ca²⁺) — The most important brewing ion. Calcium lowers mash pH (critical for enzyme activity), promotes yeast flocculation, improves beer clarity, and acts as a yeast nutrient. Target range: 50-150 ppm for most styles. Below 50 ppm, mash pH is hard to control.

Magnesium (Mg²⁺) — A yeast nutrient in small amounts (10-30 ppm). Above 50 ppm, magnesium contributes a sour, astringent bitterness.

Sodium (Na⁺) — In small amounts (10-70 ppm), sodium rounds out malt sweetness and adds body. Above 150 ppm, beer tastes salty.

Sulfate (SO₄²⁻) — The hop ion. Sulfate accentuates hop bitterness. West Coast IPAs and English bitters often target 150-350 ppm sulfate. For malt-forward styles, sulfate should stay below 50 ppm.

Chloride (Cl⁻) — The malt ion. Chloride enhances malt sweetness, body, and mouthfeel. Stouts and porters benefit from 50-150 ppm chloride.

The sulfate-to-chloride ratio is one of the most powerful tools in a brewer's water chemistry toolbox. A ratio above 2:1 favors hop character; below 1:2 favors malt character; 1:1 is balanced.

Bicarbonate (HCO₃⁻) / Alkalinity — The pH buffer. Bicarbonate raises mash pH, desirable for dark beers but problematic for pale beers.

What Water Treatment Equipment Does

A comprehensive water treatment system typically includes:

Reverse Osmosis (RO) — Removes 98-99% of minerals. RO systems exert 150-250 psi of pressure to force water through a semipermeable membrane that removes up to 97% of dissolved inorganic matter and more than 99% of large dissolved organic material.

Pre-filtration — Removes sediment and particles down to 1 micron.

Carbon pre-treatment — Removes chlorine and chloramines that can create off-flavors.

Water softening — Removes hardness and calcium.

UV disinfection — Provides final microbial protection.

Real-World Applications

Moore River Brewing in Western Australia faced bore water as their only source. The solution included a bore pump feeding three storage tanks, dual pumps for distribution, twin-stage filtration down to 1 micron, a water softener, and a UV disinfection system. The result: consistent, high-quality water supply for brewing operations.

Rebellion Beer Company installed an RO system that strips water back to a pure base, removing 98-99% of minerals. Their systems give complete confidence in the water profile day in, day out.

MadTree Brewing uses a 100-gallon-per-minute RO system that removes up to 97% of dissolved inorganic matter.

Gold Ochsen brewery in Germany invested approximately 200,000 euros in an RO plant for water desalination and treatment.

The Business Case

Water treatment is not just about beer quality — it is about equipment protection. Proper water treatment reduces scaling and corrosion, extending the life of your brewhouse, heat exchangers, and fermentation tanks.

The right system will also reduce water consumption — a growing concern as water costs rise and environmental regulations tighten. Digital sensors, flow meters, and cloud-connected devices enable real-time monitoring of water quality and usage.

What is in your water? Before you brew another batch, let us help you understand your water chemistry and design a treatment system that gives you complete control. Leave a message below with your water source details, and we will send you a customized water treatment recommendation.