The second most popular filter material is silicon carbide, or SiC.

The cheaper filter material used in the monochromatic past dictated red and blue for convenience and cost.

Mechanical air filters remove particles by capturing them on filter materials.

It was formerly used in Kent brand cigarettes as a filter material.

Sand is the most common filter material.

Some filter materials, such as plastic "bioballs", are best used for biological filtration.

These two parameters are used today to specify the size of filter materials for water purification applications.

Then the filter material, a form of clay, will be combined with the sludge and incorporated into glass, a process that will end in 1994.

Normally, color in movies and photographs is created by recording the image using filter material sensitive to red, green and blue light values.

In recent years, due to its disadvantages, other filter materials have largely replaced it (see below).