Common media include diatomaceous earth, or kieselguhr, and perlite.
From the en.wikipedia.org
These tests revealed that some kieselguhr samples release arsenic.
From the sciencedaily.com
These are often incompressible diatomaceous earth, or kieselguhr, which is composed primarily of silica.
From the en.wikipedia.org
He said that breweries, wineries and other food processors that use kieselguhr should be aware that the substance can release arsenic.
From the sciencedaily.com
Substitutes for kieselguhr are available, he noted, and simple measures like washing kieselguhr with water can remove the arsenic before use.
From the sciencedaily.com
The cell-free extract was produced by combining dry yeast cells, quartz and kieselguhr and then pulverizing the yeast cells with a mortar and pestle.
From the en.wikipedia.org
Conventional beer filters are made of either densely packed fibres or a dusty material called kieselguhr, which consists of fossilised hard-walled algae called diatoms.
From the newscientist.com
More examples
Diatomaceous earth: a light soil consisting of siliceous diatom remains and often used as a filtering material
Diatomaceous earth also known as diatomite or kieselgur, is a naturally occurring, soft, siliceous sedimentary rock that is easily crumbled into a fine white to off-white powder. It has a particle size ranging from less than 1nmicron to more than 1 millimeter, but typically 10 to 200nmicrons. ...
A kind of soft rock containing the remains of diatoms; it absorbs nitroglycerine and is used to manufacture dynamite
(geology) Kieselguhr (infusorial earth)
A very fine powder, produced from the remains of prehistoric freshwater or saltwater algae, rich in silicic acid. Kieselguhr (or unconsolidated diatomite) has the ability to bind the sludge particles which produce turbidity. ...