Products named as assistants to the leak have been created with the intention of saving time in filtration processes difficult samples or specific investigations where the time spent in the leak should be brief.

Diatomaceous earth (Kiselgur)

White sedimentary rocks, with a very porous and therefore light structure, are extracted. Are formed by the accumulation of siliceous shells of algae in fossil state. Have been used for years as filtration assitants in polishing processes in the manufacture of edible oils, wines, alcohols, pharmaceuticals products, etc. due to the excellent properties of adsorption of the kieselgur.

Ref	Retention μm	Size soils μm	Permebeality darcies	Filtration
TD 60	1.2	66	6.5	Quick
TD 12	0.7	24	0.8	Medium
TD 1 SL	0.1	13	0.07	Slow