—Filtration ⚫ – Separation of bacteria from suspending liquid. ⚫ – Removes microbes by passage of a liquid or gas through a screen like material. Most filters consist of diatomaceous earth, cellulose acetate or nitrocellulose. ⚫ – 0.45 m filters removes most bacteria, ⚫ 0.20 m more inclusive, viruses need 0.01 m. ⚫ – Useful for sterilizing liquids (enzymes, vaccines) that are destroyed by heat.—Filtration ⚫ – Separation of bacteria from suspending liquid. ⚫ – Removes microbes by passage of a liquid or gas through a screen like material. Most filters consist of diatomaceous earth, cellulose acetate or nitrocellulose. ⚫ – 0.45 m filters removes most bacteria, ⚫ 0.20 m more inclusive, viruses need 0.01 m. ⚫ – Useful for sterilizing liquids (enzymes, vaccines) that are destroyed by heat