Cold water holds less dissolved gas—including minerals? Not exactly. But refrigeration slows bacterial growth. A pitcher of tap water in the fridge for 48 hours reduces microbe counts by up to 70%.
The downside: minerals still hang around like stubborn house sitters. Use this method only if your tap water is already low in hardness. Or if you enjoy lukewarm, slightly less scary air.
Pro tip: refrigerated water also fights mold in ultrasonic humidifiers. Mold loves warm, stagnant water. Keep it cold, keep it moving. Your lungs will throw a tiny party.
