germguardian Guardian Technologies FLT41002PK FLT4100 HEPA Replacement Filter E for AC4100, AC4100CA AC4150BL, AC4150PCA, 2 pack, Black Air Purifier

It works fine super easy to install and I can tell the difference in the air with this new filter.

The whole air purifier is great. As others have stated, it seems as if they have gone cheap on the carbon filter. You can buy a bunch of carbon filters from anyone, and just double up. After that, it is still a good price

We use this filter every night while our sons are sleeping. It’s aggravating to have to constantly check the pricing because it changes regularly. We are about to switch purifiers if I have to pay $20 a filter now when I can get the machine for sometimes as low as under $50.

Aug. 2019 product recd. Update on prior reviews. Been ordering these filters multiple times for a very long time. The purifiers work so very well. Noticed that the pre-filters are getting thinner and thinner. The 2 I just received are tissue paper thin and many spots thin enough to see the pleats on the main filter thru. Will keep an eye going forward to see if the filters are made thicker (as they used to be). If not, this will cause the main filters to have to be replaced even more frequently. Not something I am willing to purchase more frequently if not necessary. Works wonderful and keeps the air cleaner then expected for a smaller unit. Filter is easy to install and has to be changed with your usage of the purifier. A great system.

I had my air filter for about 8 months. I have been using it 24/7 more frequently because I now live with a cat and am allergic. As you can see it works very well. I noticed when it needed to be changed when I started sneezing and was congested. Once I replaced it, I slept amazing that night with no congestion in the morning! It lasts a long time and is SO easy to replace. A very reasonable price for how long it lasts. I will update when I replace this current one to give a more accurate length when using it 24/7.

I do not have the means to test if this works but it filters my farts out of the air so thats cool. Very easy to change and use.

This is a HEPA-rated air filter for a unit I use in my bedroom at night to help me sleep. After about 6 months use I needed to replace my worn filter for a new one. This one fit the bill. I suppose it cleans and filters the air, the filter sure looks like its battle-worn. So pop in the new one and I suppose its doing its job and cleaning the air I breath. Dont know if it works against Covid or not but taking no chances. My inside air is going to be fresh and clean with two different air filters running, both HEPA, as well as my home a/c unit with HEPA filter.

Works but could be better fitting into filter and more sealed

this is an air cleaner filter. it seems to work fine.

I went to the allergist and so I was allergic to every tree grass dust mite so I got this to help with breathing works very well