Totally useless product. They say computer controlled. It is bluff. Nothing of that sort. The filter change alarm is set to 2000 hours. After replacement you have to reset. else it shows false alarms. Spares not properly maintained. Always want to rob the users to pay for their franchise. They are maintaining secrecy to the extent that the phone number of their office is also a top secret. I tried to get over chat and the people want my details while abruptly TE