Why RO Brewers Still Need a Water Test; Short Burst Hot Break- Fast reads. Big flavor.

Why RO Brewers Still Need a Water Test

A lot of homebrewers assume that using reverse osmosis (RO) water means they’re starting with a perfectly clean slate—zero minerals across the board. While RO is a great way to control your brewing water, the truth is a little more complicated. Your system’s performance and setup can introduce variables that make testing still worthwhile.

The first factor is Filter Efficiency. Over time, RO membranes lose their ability to strip out dissolved solids. That’s why professionals use a Filter Efficiency Test (FET)—a simple check to see if your unit is still pulling minerals down to expected levels. Without it, you may be adding brewing salts to water that already has more dissolved solids than you think.

Second, many RO systems for drinking water are sold with sixth or seventh stage remineralization cartridges. These add back calcium, magnesium, and other ions for taste and “health.” That’s fine for drinking water, but it means your supposedly blank brewing water is already mineralized—often with exactly the ions we’re carefully trying to balance.

So while RO is a great choice for consistency, don’t skip the test. Knowing your actual water profile—whether from a fresh FET or lab analysis—ensures your salt additions are accurate and your beer tastes exactly the way you planned.

Want your brewing water tested?

Curious about your water for brewing? We offer easy testing for minerals, pH, alkalinity, and more.
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Location: Midway, GA 31320, USA

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