Electronic filters are very effective at filtering small particles but are also noisy, relatively expensive, and difficult to service compared with mechanical or electrostatic types. As indicated ...

Sand filter - The sand filter is the most common type of gravity filter ... where the cake is discharged through mechanical or pneumatic means, and then back to the point of slurry application. A ...

Filter feeders are everywhere in the animal world, from tiny crustaceans and certain types of coral and krill, to various ...