Shark - 3-in-1 MAX Air Purifier (HC502)
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Reddit Reviews:
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Based on 1 year's data from Feb 24, 2026 How it works
Liked most:
13
2
"Work great and the one in the basement really keeps the kitty litter smell to 0."
"They are definitely game changers and help with smell, but also dust."
"I have 2 dogs and there’s a noticeable improvement in pet smell."
3
0
"Both have HEPA filters and work well and are also pretty quiet, no problem with running them while I sleep."
"They’re very quiet I never hear them"
"Both have HEPA filters and work well and are also pretty quiet, no problem with running them while I sleep."
17
5
"Work great and the one in the basement really keeps the kitty litter smell to 0."
"My college age son has allergies and always wakes up feeling crappy, he said he actually felt good this morning."
"They are definitely game changers and help with smell, but also dust."
15
9
"It’s been kicking on a lot lately because it detects bacteria and viruses in the air. 🦠"
"mine always goes berserk when I start cooking"
"It also changes when I cook, a cat uses the litter box, my husband walks inside from smoking, etc."
3
0
"It does pick up hair and what not. Usually open it up and pull hair off of the outside of the filter every month."
"keeps the dust and cat hair under control"
"keeps the dust and cat hair under control"
Disliked most:
0
8
"According to Shark, my air quality is a perfect 100% ALL DAY LONG. Even when: - My elderly Akita wanders by shedding fur like it's his job (and also pooting pretty non-stop) - I deliberately sprayed Lysol directly in front of it (for science!) ... The Shark? "100% perfect air, nothing to see here!" 🙄 ... But because it thinks the air is always fantastic, when I put it on auto/Eco mode, the higher fan rate is never triggered. ... It turned bright red, and said that the air would be clean again unless 60 minutes. It was back to 100 within a minute or two."
"It's no wonder the filters last for 5 years, the thing never runs. ... They are not "purifying the air" if they are not moving the air through the filters."
"I ordered 4 of these things and ALL of them sat off all day and night saying the air was perfect. ... All 4 of them did the same thing and would rarely come on."
6
10
"Also I just put it in the bathroom w my bf while he poops. No change in the air reading or smell of the bathroom."
"According to Shark, my air quality is a perfect 100% ALL DAY LONG. Even when: - My elderly Akita wanders by shedding fur like it's his job (and also pooting pretty non-stop) - I deliberately sprayed Lysol directly in front of it (for science!) ... The Shark? "100% perfect air, nothing to see here!" 🙄 ... But because it thinks the air is always fantastic, when I put it on auto/Eco mode, the higher fan rate is never triggered. ... It turned bright red, and said that the air would be clean again unless 60 minutes. It was back to 100 within a minute or two."
"I ordered 4 of these things and ALL of them sat off all day and night saying the air was perfect. ... All 4 of them did the same thing and would rarely come on."
3
4
"All of my shark max filters lasted less than 1 year and I have replace filter error."
"I've had a bit of a problem finding replacement filters for them. ... The times I've checked they are even sold out on the Shark website."
"It advertises as lasting 5 years between changes, but I think that is inaccurate because each environment is different. I think mine will need yearly or bi-yearly changes."
3
4
"All of my shark max filters lasted less than 1 year and I have replace filter error."
"I've had a bit of a problem finding replacement filters for them. ... The times I've checked they are even sold out on the Shark website."
"It advertises as lasting 5 years between changes, but I think that is inaccurate because each environment is different. I think mine will need yearly or bi-yearly changes."
2
5
"It's no wonder the filters last for 5 years, the thing never runs. ... They are not "purifying the air" if they are not moving the air through the filters."
"All of my shark max filters lasted less than 1 year and I have replace filter error."
"I got two and it's getting super clogged with the senors. ... I put a new filter in and it's still 0%."
Electronic-Owl1429 1.0I use a couple of Winix air purifiers from Costco. I have also used a Shark 3 in 1 clean sense. Both have HEPA filters and work well and are also pretty quiet, no problem with running them while I sleep.
Aggravating_Toe_9175 0.1Looks the same as ours we got a year ago. We have a dog, three cats, and two children. Really the only time it goes low is if we are cooking bacon. I usually just leave it at level two speed. It does pick up hair and what not. Usually open it up and pull hair off of the outside of the filter every month.
alfnyc 0.1I have had mine for a few months and mine works great. It’s super sensitive. It is on auto and I can see it working when I’m cooking and when my HVAC turns on. I have a 105 year old house and it has noticeably helped my allergies. Not sure if maybe it’s the placement? No real idea honestly.
bananaicepuffbar 0.1As soon as we took this thing out of the box and set it up I knew it didn’t actually work. I’ve had other air purifiers and this thing just never ran. Returned it that same night.
bhudak 0.1I have had one of these for a couple years. I know it's pulling in air because of all the cat hair I have to clean off of it. It also changes when I cook, a cat uses the litter box, my husband walks inside from smoking, etc. Sound like your might be a dud. The "air quality" detector is 4 small holes on the back. Bring a burning candle or put out a match near those spots to see if the reported air quality changes.
Bootyos 0.1I got two and it's getting super clogged with the senors. I put a new filter in and it's still 0%. Just make sure you clean it frequently.
You also have it to close to the wall. The sensors that read the air are in the back. The directions say it needs to be like 6 inches away from the wall to work correctly. https://preview.redd.it/cu3dvtfrocne1.png?width=1440&format=png&auto=webp&s=a9aaba9a94e2bcba209f5c6033b693a6d48727a4
Dapper_Ice_1705 0.1I got a great Black Friday deal on the Shark Max last year. No apps and filters seem to be available through Shark and third parties easily. Yet to see how long it will last but I don’t do see any issues.
Electrical-Ad1288 0.1Mine drops to 0 whenever I cook anything. If I open the balcony door during the winter inversion, the number drops by a lot as well.
Engin33rh3r3 0.1Where do we get replacement filters? All of my shark max filters lasted less than 1 year and I have replace filter error.
Jewfros 0.1Mine didn’t change either until I started cooking and the smoke will make it change pretty quickly.
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