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Thank you for your interest in the KC850U Sharp air purifier. Sharp Electronics advises users should only operate this purifier in the regions covered by the warranty. The water should be replaced daily. Sharp does not make any models that automatically refill the water. We do not have a recommendation for the best humidity percentage because there are too many variables that could determine the number. You will need to select the setting that best suits your personal preferences.
Sorry, there was a problem. Please try again later.We have been running the unit 24/7 for more than a month. I fill the tank each morning and evening - it is usually about 1/3 full at these times. There is a red light that comes on if the tank is empty. The unit continues to purify the air it just doesn't humidify
Sorry, there was a problem. Please try again later.i have to fill with water everyday
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