Top positive review
Initial impressions -- slick!
29 June 2017
Update ** 2nd Jan 2018 **
Taking a star off my rating on these for the following 2 reasons:
1. There is no indicator by the purifier -- either on the device itself or via the app -- that the filter inside needs cleaning. Yesterday when I opened my air purifiers, all 4 of them had their filter drums covered by thick dirt. This is part of the SOP (standard operating procedure) of any purifier that the filters get dirty over time. But this purifier puts the onus on the customer to remember to clean the filter. My honeywell and philips give visual indications on their control panels that the filters need to be cleaned. Maybe MI will take care of this in the next iteration.
2. The air quality sensor goes out of whack sometimes and will start showing PM levels in 200s when another MI purifier in the same room will be showing the more accurate PM level of say in 60s. The cleaning of the sensor remedies the situation but for the sensor to start misbehaving out of the blue is unexpected and doesn't inspire confidence.
On the plus side, I do use the automation tab in the app to turn these purifiers on automatically during certain times of the day which is a nice feature!
Update ** 2nd Nov 2017**
These purifiers continue to perform impressively. At a time when Delhi and its surrounding areas are touching 300s and 400s AQIs (really sad to see this!), these workhorses are able to bring down the AQI inside my apartment to below 50. I bought 2 more of these when these went down to Rs 9000/pc. Adding to the tips below:
1. Every room, with the exception of your bathrooms and kitchen, in your house needs at least 1 of these, depending on the room size. Don't ever make the mistake of assuming that a single purifier, no matter how powerful, will ever cover more than 1 room -- be it living, dining, or bedroom -- no matter how big or small.
2. To extract the maximum effectiveness out of any purifier, make sure that your room is kept closed as much as possible when the purifier is ON. This is an absolute must to obtain Green-level AQI figures and more importantly to sustain these levels. The second the door of the room, or that of the apartment/house/kitchen, opens, AQI rises like crazy! The purified air is most quickly and efficiently obtained in closed rooms. If you have open living//dining areas where the purifiers are placed, make sure the bedroom/kitchen/main doors are kept closed! Of course, if the air outside is adequately good quality (which it currently is NOT), you should be ventilating the rooms to reduce the CO2 levels with the purifiers turned off.
Just received my 4th air purifier. Have 2 honeywell HAC35M1101G/W (costed me around 25K each) and a Philips 3256 (another 25K plus purifier, which I got for less than 19K on a great discount from amazon). Initial impressions -- this purifier costing less than half of the other purifiers gives them more than a decent run for their money!
1 This purifier has a CADR of over 300 (310 to be precise). More than the honeywell (CADR of 300) but less than that of Philips (CADR of 367). However, there is a discernible difference between the volume of clean air Mi throws out at max speed as compared to Philips and Honeywell. Mi Purifier 2 wins! Side-note: All the purifiers are super silent on Auto mode when the air is clean and in Night Mode.
2 Very easy to set up using the Mi Home app on iPhone (sorry, I don't own an Android phone!). Via the app on your phone, you can control the purifier remotely. This is a BIG PLUS! I can monitor air quality at home remotely (using the AirVisual node -- see below) and turn this purifier ON accordingly. This useful feature is lacking in Honeywell and Philips. This feature also comes in handy to use this purifier in my kids bedroom so that I can start it remotely because kids usually don't remember to start or shut down the purifier.
Via the app, you can control the following (besides seeing other stats):
- turning it on/off,
- switching the mode between auto/night/manual,
- and, the speed in manual mode
3. It also has a turbo mode which you can enable in the App settings. Only Philips, which is 3x as expensive, also offers turbo mode but this purifier's turbo mode completely blows away Philips' turbo mode. There is no comparison. Turbo mode essentially cleans the air faster, but it is loud! I use this mode sparingly.
4. The purifier throws the clean air vertically upwards the way the purifiers should so that there is no obstruction in the dispersion of the clean air. Philips and Honeywell throw the clean air upwards too, but at an angle because the way their vents are located. This is less than ideal because then the clean air hits the wall and bounces off of that.
-- the air quality reading isn't accurate. But then, no air purifier has accurate PM 2.5 reading. They tend to give the PM reading of the air which is in their immediate vicinity.
-- unit doesn't have a convenient handle to carry. But it is a light unit.
So, how does it perform?
I own an AirVisual node that I got from the US which gives extremely accurate reading of the air quality inside. When I put the node physically on the exhaust vents of the purifiers operating at full speeds, the lowest AQI reading I have seen are as below (anything below 50 is considered to be good):
-- the honeywell purifiers: 17
-- Philips: 4.
-- Mi Air Purifier 2 gets me a reading of 1. That's the lowest and best possible!!
The proof is in the pudding! If this air purifier continues to perform good, I may just consider selling the Honeywell purifiers and get more of these!!
PS: Folks have said that the filters would need to be replaced frequently on this purifier. Well, that *might* be true.
Air Filter Life, an update after 10 days:
The filter life at 100% is 145 days i.e. when you have bought unit brand new. I have now been operating the purifier daily for 10 days. The remaining life of the filter is however at 141 days and not 135 days. That's because I have used it for 90 hours (i.e. roughly 4 days) in the 10 days I have used it. Point being -- the filter will last you much longer than the 145 days because you only need to run the purifiers during certain times of the day -- before, during, and after cooking hours, an hour before ur bedtime (during night, it can be left on AUTO), or right AFTER you have u have opened the windows for ventilation (i.e. use the purifiers after you have closed the windows). Of course if you run it 24x7, it will last 145 days, but then you shouldn't be running these 24x7 (see tips below).
- ensure that you have the air purifiers running in manual mode or at least at a speed of 3 (Medium). Running air purifiers in AUTO is simply pointless! All it does is save you electricity. What it does NOT do is clean air as fast as it should because the sensors on purifiers aren't that smart. In auto mode, they will respond to AQI levels of the air near to the purifier, which are low because that air is clean anyways. I highly recommend running them at least at a speed of 3.
- ventilate your home/apartment early morning hours for 30-45 mins and maybe once in the evening to reduce the CO2 levels by opening your windows and turning on the ceiling fans. During these times the purifiers should be off. Ventilation would deteriorate the AQI level though. So turn on the purifiers right after the ventilation.
-- Turn OFF your purifiers when there is dusting/brooming/any sort of work that blows more dust than usual (carpentry etc) going on in the house. This will clog the filters faster. Turn the purifiers on AFTER the dust work has finished.
- please dump those "agarbattis" and air freshners if you have any. They would spike the AQI to over 200 in a jiffy!!