Along with the humidifier, I purchased a purifier from Philips. If I fill in tap water and turn on the humidifier, the purifier goes crazy and shows a PM 2.5 level above 300. The problem was instantly solved when I poured distilled water into the humidifier - the pollution level dropped to 35. Obviously, the built-in filter is not working and the humidifier along with the water throws a bunch of scale and impurities into the air. And you can breathe it. Since I didn’t find better options for humidifiers at all (this is the best of ultrasonic ones - well, maybe Dyson is just as good, I didn’t compare, but all traditional humidifiers are weaker), I recommend it, but only in conjunction with normal hygrometers (not for 1500r, but testo level) and a reverse osmosis system. Py. Sy. Review copied from my own review on Ozon
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