I am using the US brand, which has been proved to have effeciency ot up to 99.99% & the powerful effect is: it can remove 84 types of cntaminants with low electric power cost! Beside, this machine is recommended by doctor. Very suitable for kids/ adult with sensitive.
My friend's daughter has high sensitive nose, she can't sleep well since she was around 3. Her parents realy can't help on her with many doctors before. However, when her father put this machine in her sleeping room, she can sleep without wake up. I then buy one for my home (with old people & kid together) & use it daily/ while at home.
Yes, I feel that it is really useful! My friend's brother daughter cannot sleep well for years, she need to wake up for few times during night (because she got "sensitive" nose...this make her cannot sleep well ..), however, once open the air purifier machince, she can sleep all the nights without wake up!!
For the brand, we are using the same one (from Amway), the quality is super & electirc fee is $10/ year at 8 hrs per day lar............
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