Reverse osmosis produces nearly pure water, which is not ideal for coffee brewing because pure water can become corrosive in machines and lacks the minerals needed for optimal extraction; most home RO units produce water that is too soft for good coffee.
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James HoffmannEvidence Quote
“what you get out of it though is nearly pure water which again isn't actually ideal if you put distilled water into a coffee machine well that's typically bad because it can become quite corrosive and again we know that we need some minerals in order to get the best tasting coffee”
Created: 8/13/2026, 9:49:47 AM
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