Can I Use a HEPA Furnace Filter?
A HEPA filter uses a dense filtration material and must remove at least 99.7% of airborne particles that are 0.3 microns or larger. This level of filtration is much better than a standard pleated or fiberglass filter.
Unfortunately, HEPA filters restrict too much air to be used as a traditional furnace filter. A HEPA filter is extremely efficient, but a significant amount of air pressure is needed to force air through a HEPA filter. A typical HVAC system will not be equipped to provide enough air pressure to use a HEPA filter (which means that no air would blow out of your registers).
In order to use a HEPA filter for whole house filtration, you need to install a separate HEPA filtration system. A system like this will pull some of the air out of the regular air flow through your furnace, and then boost the air and pass it through a HEPA filter. The extremely filtered air is then returned back into the normal air flow.
Refrigerator Water Filter Tip #3:
When a new refrigerator filter is installed, there may be some sputtering and spitting of water while air is forced out of the filter media. This is normal and will stop after the carbon media becomes saturated with water.