He separates from her and meets up with an Irishman looking for the Kieselguhr Kid. His brother Alfred later managed to stabilize dynamite with a diatomaceous earth called kieselguhr. Biologically generated forms are also known as kieselguhr and diatomaceous earth. Common media include diatomaceous earth (kieselguhr) and perlite. A Berkefeld filter is a water filter made of diatomaceous earth ("Kieselguhr"). The 1930 US patent also mentions kieselguhr (diatomaceous earth). A common filter aid is Kieselguhr, which give 0.85 voidage. It may be fine earth (Kieselguhr), cardboard sheets, membranes, or Cross-flow filtration. These are often incompressible diatomaceous earth, or kieselguhr, which is composed primarily of silica.