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expired Posted by n9zang • Jun 18, 2024
expired Posted by n9zang • Jun 18, 2024

Membrane Solutions MSA3 3-Stage True HEPA Air Purifier (Up to 1590 sq ft.)

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$63

$140

55% off
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Ravenna Global via Amazon has Membrane Solutions 3-Stage True HEPA Air Purifier (MSA3) on sale for $89.69 - 30% off when you click 'Redeem' on the product page or apply promo code U94AB4G9 on the checkout page = $62.78. Shipping is free.
  • Note: Must be logged in to clip coupons; coupons are typically one-time use.
Thanks to Community Member n9zang for sharing this deal.

About this product:
  • 3-stage filtration design: Pre-Filter, H13 TRUE HEPA Filter, and Activated Carbon Filter
  • Uses an H13 True HEPA PP electrostatic electret melt-blown filter
  • Filters out 99.97% of particles as small as 0.01 microns and air pollution PM 2.5 (particulate matter)
  • Removes pet dander, dust, pollen, smoke, odor, mold, etc.
  • Large room max coverage up to 1590ft² in 60 minutes
  • Low noise level (22dB) when in sleep mode
  • 100% Ozone free air cleaner
  • Certified to ETL, FCC, CE, and RoHS

Editor's Notes

Written by qwikwit | Staff
  • About this Store:
  • Additional Information:
    • Rated 4.5 out of 5 stars on Amazon based on over 9405 customer reviews.
    • Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

Original Post

Written by n9zang
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Ravenna Global via Amazon has Membrane Solutions 3-Stage True HEPA Air Purifier (MSA3) on sale for $89.69 - 30% off when you click 'Redeem' on the product page or apply promo code U94AB4G9 on the checkout page = $62.78. Shipping is free.
  • Note: Must be logged in to clip coupons; coupons are typically one-time use.
Thanks to Community Member n9zang for sharing this deal.

About this product:
  • 3-stage filtration design: Pre-Filter, H13 TRUE HEPA Filter, and Activated Carbon Filter
  • Uses an H13 True HEPA PP electrostatic electret melt-blown filter
  • Filters out 99.97% of particles as small as 0.01 microns and air pollution PM 2.5 (particulate matter)
  • Removes pet dander, dust, pollen, smoke, odor, mold, etc.
  • Large room max coverage up to 1590ft² in 60 minutes
  • Low noise level (22dB) when in sleep mode
  • 100% Ozone free air cleaner
  • Certified to ETL, FCC, CE, and RoHS

Editor's Notes

Written by qwikwit | Staff
  • About this Store:
  • Additional Information:
    • Rated 4.5 out of 5 stars on Amazon based on over 9405 customer reviews.
    • Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

Original Post

Written by n9zang

Community Voting

Deal Score
+36
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Visit Amazon

Price Intelligence

Model: MSA3 Air Purifier for Home Large Room and Bedroom with True HEPA Filter, 100% Ozone Free Air Cleaner for Smokers, Pet and Allergies Remove 99.97% Allergens, Dust, Odor, Smoke, Pollen

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Sort: Lowest to Highest | Last Updated 5/1/2025, 10:05 PM
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Amazon$139.99
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Top Comments

This reviewer found a replacement filter that works.

Marcia A Borst
4.0 out of 5 stars Seem to help. Update on my update
Reviewed in the United States on December 29, 2023
Style: MSA3S Air PurifierVerified Purchase
Update 2: I found less expensive replacement filter cartridges that work without modification. It seems the cartridges might work on a timer basis with replacement about every 3 or 4 months as indicated by the unit lights. The replacement filter was down to 1/4 as per light indicator. I pushed the reset button for about 5 seconds and the light indicator is now reading like it was new. I will monitor the operation thru dust accumulation on furniture. If I lived in a very active home, I could understand the fast depletion of the cartridge. That is not the case. I am wondering if most manufacturers of household units and their cartridges also work on the timer basis per operational hours and not actual air quality? I guess this is a question for manufacturers of both the unit and cartridges. I saved the original filter and wonder if the same will happen

UPDATE: My house is not high traffic and I only have 1 small dog that does not shed. I do the regular, not over the top vacuuming of the floor and furniture. I have not done any frying or heavy cooking. The filter is only 2 months old and is down to one quarter of life left. Knowing that an air filter is just a fan and filter, my next purchase will be a less expensive brand with cheaper and maybe universal type filter. I have noticed less dust on the furniture and electronics (dust magnets!) but think smaller units, with strategic placement might do the job as well. I still compliment the manufacturer for making a good product, but filter cartridge life is no where near what is advertised.
I purchased the smart model, my dumb move as it was impossible to pair with my Android phone even after Customer service and I tried every workaround. I was refunded the difference in price. The customer service was honest in telling me there was no difference in the units. I have been running it on Auto since my purchase about a month ago. I hesitated reviewing until I saw if it made a difference in dust and if it actually covered the square footage as advertised. It has made a difference in dust and helps eliminate cooking odors that linger. It is very quiet even on high fan. The indicator seems to be accurate turning from green to yellow to red as air quality diminishes and changes back to green. You can notice the difference in the air smells. Since the coverage area in less than stated, I will be purchasing another to put in the larger master bedroom. Bottom line, don't look for miracles. Make sure you dust and vacuum before your initial startup. Unfortunately it won't suck the dust off or out of furniture; you have to do that yourself. Since I'm purchasing another, that's testimony enough to the fact that this air purifier does help. The filter cartridges are not expensive and seem to last. Remember, as in all air purifiers, they are just fans and filters.
17 people found this helpful
A box fan isn't going to be quieter than a dedicated air purifier. The Corsi-Rosenthal boxes (box fan with cube of filters) work very well because they remove more particulate because of the amount of surface area. But that DIY design is mainly for emergency situations for people in wildfire areas who have smoke air pollution and can't evacuate.

A dedicated air purifier is better for every day use. Besides the fact that it isn't unsightly like having 4 filters taped to a box fan, air purifiers also have ionizers and charcoal filters for removing bad smells. They also often have automatically adjusting fan speed based on air quality.

So yeah, the DIY "cube of furnace filters" work well, but they are mainly used in situations where you are experiencing extreme air pollution and you wouldn't mind running the ugly massive duct taped monstrosity because you need to clean a LOT of heavily polluted air.
Some of us have the money to afford to not have to ghetto bootleg our box fans. My Winix also automatically decreases/increases fan speed based on the environment and let's me know when I should change the filters.

69 Comments

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Jun 21, 2024
1 Posts
Joined Nov 2023
Jun 21, 2024
BeigeLlama3931
Jun 21, 2024
1 Posts
Quote from JasonB24 :
I have this exact model, since 2021. Work fine with me. Does suck a lot of dust on the filter and I washed the filter and just reused the filter. ​
I can see getting a little more life out of it by washing, although visually youre removing that thick layer of dust and mostly dead skin…i can tell you that the most of it, like allergens and stuff is going to have clogged its finer permeate layers and i dont think those particles and smaller are going to rinse out, think how smoke would act.
Jun 21, 2024
162 Posts
Joined Jun 2012
Jun 21, 2024
wordsfly
Jun 21, 2024
162 Posts
Aren't the DIY folks forgetting you need a reversable box fan or else you're going in the wrong direction. You also need someone on the other end of that filter to contain it.
2
Pro
Jun 22, 2024
2,815 Posts
Joined Mar 2007
Jun 22, 2024
hkteaman
Pro
Jun 22, 2024
2,815 Posts
I just got around to open the packaging and read the instruction. The filter is good for 1,700 hours before the filter replacement light turns on, that's 71 days when running 24/7. That's going to be 5 filters in a year. I don't remember seeing this on the description.

Decision time, I may have to return this and stick with the Winix c545 that's coming tomorrow.
Last edited by hkteaman June 21, 2024 at 08:25 PM.
Jun 22, 2024
87 Posts
Joined Nov 2021
Jun 22, 2024
Basecall
Jun 22, 2024
87 Posts
Insane in the membrane!
Jun 22, 2024
1,239 Posts
Joined Nov 2012
Jun 22, 2024
i_max2k2
Jun 22, 2024
1,239 Posts
Quote from hkteaman :
I just got around to open the packaging and read the instruction. The filter is good for 1,700 hours before the filter replacement light turns on, that's 71 days when running 24/7. That's going to be 5 filters in a year. I don't remember seeing this on the description.

Decision time, I may have to return this and stick with the Winix c545 that's coming tomorrow.
Could you please check something. If you connect it to the outlet and turn it on, if you then unplug and replug it back, does it start running? Trying to see if it can be automated using a smart plug.
Jun 22, 2024
167 Posts
Joined Jun 2011
Jun 22, 2024
CheapBasturd
Jun 22, 2024
167 Posts
So what are the replacement filter people are talking about? Does anyone have a link?
Jun 22, 2024
431 Posts
Joined Sep 2015
Jun 22, 2024
spiffytexan
Jun 22, 2024
431 Posts
Quote from I_like_feet :
I don't want to look like I live in a trailer park. Ever seen a fancy trailer park? Neither have I.
The CADR of a CR box is 800.

The CADR of this unit is 112. So you need SEVEN of these to equal one CR box.

Seven of these will be insanely loud, and more unsightly than one CR box. (You can buy aesthetic CR boxes. Don't buy low quality stuff like this when it performs so much worse.)

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Jun 22, 2024
431 Posts
Joined Sep 2015
Jun 22, 2024
spiffytexan
Jun 22, 2024
431 Posts
Quote from JoeJ9362 :
Some of us have the money to afford to not have to ghetto bootleg our box fans. My Winix also automatically decreases/increases fan speed based on the environment and let's me know when I should change the filters.
Sup. I'm rich. The CADR of a CR box is 800.

The CADR of this unit is 112. So you need SEVEN of these to equal one CR box.

Seven of these will be insanely loud, and more unsightly than one CR box. (You can buy aesthetic CR boxes. Don't buy low quality stuff like this when it performs so much worse.)

One CR box with a good quality fan is actually quieter than a single air purifier - most of which have cheap loud small fans.
2
Jun 22, 2024
368 Posts
Joined Aug 2023
Jun 22, 2024
I_like_feet
Jun 22, 2024
368 Posts
Quote from spiffytexan :
The CADR of a CR box is 800.

The CADR of this unit is 112. So you need SEVEN of these to equal one CR box.

Seven of these will be insanely loud, and more unsightly than one CR box. (You can buy aesthetic CR boxes. Don't buy low quality stuff like this when it performs so much worse.)
I don't have this unit or plan on buying it.
Last edited by I_like_feet June 22, 2024 at 10:42 AM.
Jun 22, 2024
431 Posts
Joined Sep 2015
Jun 22, 2024
spiffytexan
Jun 22, 2024
431 Posts
Quote from I_like_feet :
I don't have this unit or plan on buying it.
Regardless, the numbers are similar for almost any HEPA unit.

HEPA units are almost all functionally scams. Dust is generated or blows in faster than the filter can clean the air. (Home air exchanges with outside air something like 2x an hour. If your filter doesn't have the CADR to keep up, it's kinda useless.)
1
Pro
Jun 22, 2024
2,815 Posts
Joined Mar 2007
Jun 22, 2024
hkteaman
Pro
Jun 22, 2024
2,815 Posts
Quote from i_max2k2 :
Could you please check something. If you connect it to the outlet and turn it on, if you then unplug and replug it back, does it start running? Trying to see if it can be automated using a smart plug.
I have to touch the power button in order for the unit to turn on again and it defaults to med when turned back on.
Jun 22, 2024
2,304 Posts
Joined Apr 2010
Jun 22, 2024
FatFaluz
Jun 22, 2024
2,304 Posts
Claimed CADR is 112 cfm (found on their website but not on Amazon or PDF manual), which is less than half that of Winix C545 (certified 243 cfm). No air quality sensor so therefore no auto fan speed mode (which requires an AQ sensor).

Not to mention they deliberately did not get it on Energy Star or AHAM listed/certified list because they know they are inferior to popular models from Winix, Coway, or even Shark. 1700~2000 hour filter life seems suspiciously short for a filter this size so either they assume people will run it at higher speed or they just want to milk more filter sales. Given the unit size and weight very close to the Winix, it really should perform much better if it has the right components (mainly a DC brushless motor). This Seattle company seems to specialize in water filtration so maybe they got this crappy model cheap on Alibaba to jump on the air purification bandwagon.
Last edited by FatFaluz June 22, 2024 at 01:57 PM.
Jun 22, 2024
3,217 Posts
Joined Dec 2005
Jun 22, 2024
Mr. Sparkles
Jun 22, 2024
3,217 Posts
Quote from hkteaman :
Yes, on the other video the woman said 840 SF in 1 hour.
Air changes of 8x per hour has been recommended for respiratory disease. Filters units are often not tested for HEPA level filtering at all fan speeds, so leaks can happen at higher fan speeds, making the effective air change rate (CADR) lower.

Get biggest filter possible, run at lowest setting to achieve desired air change rate.
Jun 22, 2024
3,217 Posts
Joined Dec 2005
Jun 22, 2024
Mr. Sparkles
Jun 22, 2024
3,217 Posts
Quote from spiffytexan :
Regardless, the numbers are similar for almost any HEPA unit.

HEPA units are almost all functionally scams. Dust is generated or blows in faster than the filter can clean the air. (Home air exchanges with outside air something like 2x an hour. If your filter doesn't have the CADR to keep up, it's kinda useless.)
Additionally, many units are not tested for HEPA lvl filtration at all fan speeds. Unless specified, one should assume the actual filter (air exchange) rate is only effectively whatever the lowest fan setting provides.

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Jun 23, 2024
3,286 Posts
Joined May 2004
Jun 23, 2024
starfoxinstinct
Jun 23, 2024
3,286 Posts
Quote from MWink :
How to make a Corsi-Rosenthal Box [wikipedia.org]



Did you install the shroud? It makes them considerably quieter.
I was not aware of the shroud. Thanks for the tip!

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