The use of filter aids and precoat filtration is ubiquitous in a wide number of industries, including
chemicals, food processing, pharmaceuticals, mining, municipal (potable) water treatment and waste
treatment.Filter aids are inorganic mineral powders or organic fibrous materials which are used in combination
with filtration hardware to enhance filtration performance. Commonly encountered filter aids include
diatomite, perlite and cellulose, and some of these materials have been in use for over seventy-five
years.