i have been using Xiomi Sfor more than 6months and i would say its Perfect purifier. dan me ammata aran denna ekak hoyanawa .... Filter eka changing every 4 months 9k 10k wenawa mehe........patta Air idex indoor eka 004 ta wage ara gannnawa ... Ape gewal gawa kaalakanni minissu gini pattu karanawa ekata gatte...excercice wath karanna ba reddey duma nisa..............