Blue 511i Max Smart WiFi Air Purifier, HEPASilent Dual Filtration Up To 43m², Whisper Quiet, Air Cleaner for Pets, Allergies, Virus, Dust, Mould, Smoke

Our second purchase of this model. Looks good. The app is easy to use. It's on in the bedroom all night, every night, and the first one we had lasted a few years. The air feels cleaner and according to the app the air is consistently 'excellent'. It's quiet on fan speed 1, some might find it a bit loud on fan speed 2 but you get used to the sound. Definitely helps with hayfever symptoms resulting in a better quality of sleep. Also good for removing cat dander from the air. The genuine filters are a bit pricy but they last a long time.

Easily one of my best purchases of 2025. After using it for a short time, it genuinely makes you wonder how you ever lived without an air purifier. The air quality improvement is noticeable, especially in a bedroom environment. The room feels fresher and less stuffy, and it has helped significantly with dust and general air cleanliness. The app functionality is excellent, simple to set up, responsive, and useful for monitoring air quality and adjusting settings remotely. The unit itself is fairly large, but this clearly comes down to the size of the filter, which inspires confidence rather than being a negative. It feels well built and designed to handle larger rooms properly rather than being underpowered. Noise levels are impressively low. Even when running continuously overnight, it is quiet enough not to disturb sleep, which was a major deciding factor for me. Overall, a very effective, well designed air purifier that delivers exactly what it promises. Highly recommended for anyone considering improving their indoor air quality.

Seems to work well, overall. App connectivity and usefulness is very good, it’s almost silent on the low setting but definitely would disturb sleep or TV watching in the highest. It reacts well in automatic mode to cooking smells and goes crazy if you spray a deodorant near it. However, it inexplicably fails to react to my kitten’s litter tray deposits, its blue light for “very clean/excellent air” betraying the hard reality. This is very disappointing as it was one of the reasons I got it. It also does not seem to react to cigarette and weed smells that wade through the windows of London in the warmer weather, again very disappointing. So the auto function really isn’t great. But leave it on power 2 and it cleans the air very well without too much noise. It’s also a good looking unit that will likely blend in well. Note some of the smaller sized models in the overall range don’t have the auto or app functions.

If like me you have allergies and asthma, or just want cleaner air, then this device is a must. Love my air filter. I’ve been using this constantly every night in my bedroom to reduce pollen and dust for my allergies. It works a treat and I’ve noticed a big difference in my breathing and also there’s less dust in the room when it’s time to clean. It sits quietly near my bed, automatically works every night and just works! Exactly what I need. After 6 months of use, the device reports that it still has 63% filter still in use so I’d say that you need a new filter maybe once a year, for normal domestic use- which is good economically speaking. Download the app which gives total control and this is where you can setup automated scheduling. When in ‘Auto’ mode it kicks into high fan speed on high filtration if I do something that would generate high dust particulate pollution in the air, like changing bed sheets or fluffing up the pillows. This to me, proves that the device sensors work well and adjust the airflow and filtration according to the quality of the air being sucked in. We are so impressed, we bought two. This model has relatively cheap replacement filters that are readily available. I definitely recommend this air filter.

Works perfectly fine. Connectivity from app to air purifier could be improved. Makes the air feel cleaner. Has helped with morning allergies. App includes useful information such as when the filter needs changing. Not very loud on fan 1 and 2 but is quite noisy on fan 3. I have found the schedule feature helpful.

Seems ok, and phone app is useful. I've been using this for approx one month now and the phone app connected to this device is super useful to check on the current 'air quality' level as well as viewing how much of the filter is 'left' until it is recommended to be changed. My air quality is generally good or excellent on most days, and there is still (after one full month, 90% left) of my filter for use. So, it isn't working hard and you can probably get 10 months or 12 (if you push it) per year with each filter. Operationally, usage is very quiet, which is solid plus.

Very neat not to big and very effective

Great product, however use a burner email to sign up to the app (or unsubscribe) cos they email you EVERYDAY selling you other stuff they have!

Great product in my opinion and brand too. The improvement in air quality is immediately noticeable, especially in the bedroom. The room feels fresher, less stuffy, and there’s a clear reduction in dust. The app is easy to set up, responsive, and useful for monitoring air quality and adjusting settings remotely. One can schedule times to turn on and off. It also has different modes, to select to your preference manually or via the app. Although the unit is slightly large, but fit to handle the type of room size effectively. Noise levels are impressively low, even when running on sleep mode, and it doesn’t disturb your sleep. Overall, it's a good brand, well-designed, highly effective air purifier that delivers exactly what it promises. Highly recommended.

Amazing machine, good looking, lightweight and easily moved from room to room if necessary. Totally silent unless it’s filtering a bad air environment, then the fan really turns on. We tried it near the kitchen when searing a hamburger and it registered bad air quality, even though nothing was burning, just normal browning and the hood was on. The same when changing the bedsheets and duvet covers after 1 week. It must register dust etc. We are interested to see what happens during pollen season. We are definitely less congested when waking up every morning. We run it all night on the night setting.

كنت شاك في البداية، بس الصدق الجهاز فاجأني. الجو صار أخف والنفس أريح، خاصة وقت النوم. مو معجزة، بس يسوي شغله زين. لو عندك غبار أو حساسية، بيخدمك

Molto bello Funziona molto bene Si connette ad Alexa per controllarlo Ha un sistema per attivarlo automaticamente al ritorno e viceversa Silenzioso Comoda la spia per la qualità dell’aria Prodotto eccellente

Very quiet in sleeping mode .