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

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

They fot a little snug but definitely work.

They do not last long so i am looking for the same quality for less money

The HEPA filters can be expensive and this little layer not only removes any odors from the air but acts as a prefilter for dust. This is a multi pack and you simply peal off the old one (best done outside) and then stick the new one on using the velcro strips.

I use this 24 hours a day

Fits as intended but feels a bit different than the stock one and doesn’t stick as well to the Velcro on the machine but works well

Was a little thicker than the original filter that came with air purifier. Hopefully it doesn’t effect the function of motor or fan. I just installed it so not sure.

Price is good but too big for the filter so I recommend cutting it to fit the length. Also you should really buy the original hepa replacement once a year because it comes with the WHITE and the black filters that are meant for the filter to work well.

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 honestly didnt even know what these were when I got them. Now I know they make my filter last 4x longer. Nothing touched the filter with these pre-filters properly installed and changed regularly.