Carbon Activated Pre-Filter 4-pack for use with the Germ Guardian FLT4825 HEPA Filter, AC4800 Series, Filter B By Complete Filtration Services

Price is reasonable for a filter. An original one from GermGuardian is slightly overpriced. Red light was blinking after three months. I checked a filter. There were lots of dust and small light bright color particles on a filter. Check a photo. e.g.) I vacuumed my room every two weeks, so I didnt except there were lots of dust in my room I detached an original filter and replaced it with a filter by CFS. It was slightly longer than an original filter, but it did not have any problems for installment. After the replacement, I pressed a UV button for 3-5 seconds to reset a indicator (red to green). Please check all photos here.

Direct replacement, fits perfectly.

Was able to cut to fit to replace filters from my old air purifier that became unavailable. Works good.

The filters were folded over in open plastic bag without labeling.

Works great in the air filtration unit but cannot be blown clean or washed. Must be replaced. So in the long run may be a little pricey

The filter is a great way to extend the life of my HEPA filter. Right after the 4th of July I checked the carbon pre-filter on my air purifier. The particulate matter from all the fireworks near my home had really coated the old carbon pre-filter. It was great to be able to quickly change just that bit to extend the life of my HEPA filter. Its sill important to regularly change the actual HEPA filter, but I feel that changing the charcoal pre-filter really does help to extend it for a short time

I use this 24 hours a day

I developed a late in life allergy to my cats. So I bought two air purifiers that have filters. As we know, filters are ridiculously expensive. The air filters I bought came with these carbon covers so I immediately ordered this box of 4. I would say I change them every 6-8 weeks (at minimum) and so far I have been able to keep the filter clean enough that I have not had to change it yet!

I have two of the Pure Guardian AC4825 Purifiers and change the carbon filters in them about once every 3 months. This 4 pack is perfect and fits without any problems or cutting. The price is also a lot better than buying the Pure Guardian ones.

I am extremely allergic to dust and these catch a lot of dust in my air purifier. I ought these because after I rinsed out the first one that came with the filter, I really did not want to put it back on.