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

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.

I found the genuine filter at this time to only be $1 more expensive than the off brands. Decided to go with a genuine. Came quickly an came with the charcoal pre-filter, which I had a hard time figuring out if it did on some listings. It did fit a little more snug than the original one that came with the air purifier. This is my first replacement so Im not sure if thats common or just a mishap. Either way it still works fine and I plan to keep vacuuming the pre-filter every 2 weeks.

Cleans air well.

It works as expected. My last filter I changed at 90 days just because of COVID-19 pandemic. It wasnt gunky dirty but there was visible dirt just from running it a few hours a day. I wanted to change it to get rid of any virus germs that could have been lingering there.

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

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 have such bad allergies. I love that my machine is about 4 yrs old and I can still easily find new filters here on Amazon!

Perfect fit just as advertised

The filter lasts about 3 months in my experience. The bulb has worked fine for over a year.

My daughter left this machine when they moved to Japan. I almost sold it but I said “wait, I have a dog in my bedroom “! I bought this new filter- it for perfect. I love this machine!!