Reverse osmosis (RO) is like a celebrity bouncer for your water. It pushes H₂O through a semi-permeable membrane that blocks 90–95% of nitrates. This is the gold standard for homes with stubborn contamination. You’ll often find RO systems under kitchen sinks, looking like a tiny sci-fi contraption.
Here’s a fun fact: RO was originally developed to desalinate seawater on submarines. So yes, you’re basically using submarine tech to make your ice cubes. A good system costs between $150 and $600, plus annual filter replacements. Pro tip: Look for units with a “nitrate-specific” membrane—they’re tuned to grab those molecules without wasting water.
But RO has a quirk: it removes healthy minerals like calcium and magnesium. That’s why many systems add a remineralization stage. Drink that flat water? It’s fine, but some people add a pinch of sea salt for taste. Think of it as styling your water after a detox.
