What are charged media filters?
Charged media filters work the same way as electrostatic precipitators, but they collect particles on traditional fiber filters instead of plates. The advantage of these filters is that they are able to collect very small particles, sometimes as small as 0.1 microns, through a combination of a filter and an electrostatic charge. The disadvantage is that, like the electrostatic precipitator filters, charged media filters lose their efficiency fairly quickly, and they can require more frequent filter replacements compared to HEPA air purifiers. These types of units can emit ozone, but the better ones on the market do not. If you are planning to purchase this type of air purifier, make sure that it does not emit ozone. The best air purifier in this category is the ultra-quiet Blueair air purifier.

How often do I need to replace the filter(s)?
If you're buying a HEPA air purifier, don't forget to check and see how much replacement filters will cost. Or consider the Friedrich air purifier, which uses dishwasher-safe collection plates instead of filters. If your unit includes both a HEPA filter and a carbon filter, or other combinations of filtration media, they will probably need to be replaced separately, and they may last for different periods of time.

Should I run my air purifier all the time?
We recommend that you run your air purifier continuously for optimum operation.

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