Humidity levels between 40 and 60 percent are optimal for human health. This low humidity in March at our place is a warning sign. Turning on smartmi causes us to go through an entire five-liter eggplant's worth of water in less than 24 hours. We use osmosis-filtered water, which is inherently pure, rather than tap water. You could use a standard one; however, silt will build up over time, and washing that many disks would be a nightmare.
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