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Feldspar
High Efficiency Particulate Air (HEPA) filters are used in microbiological containment protocols.
Oil
Carbon filters are used for home water purification in homes because carbon is able to filter out may toxins that are harmful.
Compressed air filters, which are also known as in-line filters, serve the purpose of filtering contaminants, such as dust, oil and moisture, from air after it has been compressed. They are usually used in industrial applications.
Helium is used for the ones that rise. Compressed air can be used or exhaled breath.
Not being curt but it's pretty self explanatory. They are filters made with paper elements. That is the element used inside the filter to trap particles is made of paper.
Four types of filters are available in Access: Filter By Selection, Common Filters, Filter By Form, and Advanced Filter/Sort.
This element is mercury.
silicon
The element most common in tothpaste is sodium.
The most common element in both is Carbon
Slicon (A+) -R.E.M.
I'm not sure that "most used element" is a thing. Most used in what?Hydrogen is the most common element in the universe, but I have no idea what you mean by "most used."
SAnd is used in sand filters. rocks are not used in pool filters.
Tungsten is the most common element used as the filament in incandescent lightbulbs.