Hi, we bought this purifier a year ago,
And it functioned good for 4 to 5 months then it started producing much noise.
We used to clean it as we were instructed even though it produced much noise which caused a disturbance for us.
After getting it serviced for the first time we noticed that it worked good for 2 months and then again it started noise.
So then after we use to get it serviced regularly for every 2 months. Its annoying me to get it serviced for every two months as it troubles us.
My advise for you is to go for a better one which uses a good technnology in it.