The word filter is a noun. Filter means (1) device that removes something from whatever passes through it, (2) an electrical device that alters the frequency spectrum of signals passing through it.
Filter is also a verb that means (1) pass through, (2) remove by passing through a filter, (3) run or flow slowly, as in drops or in an unsteady stream.
The following articles and web pages elaborate on the word filter.
HEPA filters are designed to filter the air by trapping 99.9% of airborne particles, such as dust, pollen, and tobacco smoke. HEPA stands for High Efficiency Particulate Air (filter).
A lens may be the most important part of a camera, because it forms and focuses photographic images. A filter, affixed in front of a camera lens, can help protect the lens from damage.
Visit this water filtration equipment retailer directory to find water filtration equipment retailers in the USA. The photo on this web page depicts a blue, water treatment filter.
Air purifiers filter dust, smoke, pollen, pet dander, mold spores, and other airborne particulates in the air. Learn more about air purifiers and how they work.
Regularly maintaining your dirt bike is important to keep it running smoothly. Learn about maintaining your dirt bike's oil, air filter, tires, wheels, brakes, carburetor, and more.
The following articles provide recent filter-related news.