Good afternoon At the end of May 2022, I purchased 3 filters of this model + 3 smart monitors. I left two filters in the apartment (bedroom, children's room), 1 filter was taken to the dacha. My daughter is allergic and can't stand dust. Before purchasing the filter, we daily struggled with morning nasal congestion with the help of medicines. After the acquisition, the child stopped experiencing difficulty breathing through the nose. The level of CO 2 is within the norm of 450, and the air quality is 0-i. E. does not contain impurities. In addition, the first 2 weeks we observed that they began to wake up earlier with a feeling of complete recovery - then they got used to it, but it really became much easier to wake up when you use the filter. We also use the filter in the country house in the bedroom, in addition, the smells from cooking dishes that penetrated into the bedroom disappeared when we cook - turn on the filter. I read this purchase as justified, since the results of the absence of allergies in my daughter's face, and who knows how much more medicine we would give to extinguish the dust allergy. In addition, the body recovers faster during sleep. I advise everyone
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