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Favorite Medium:
The Filter medium is that critical component which determines whether or not a Filter will perform adequately, and can be defined as 'any permeable material upon which, or within which, particles are deposited by the process of filtration' (Purchas, 1.996). The principal role of a Filter medium is to cause a clear separation of particulates from the fluid with the minimum consumption of energy. In order to achieve this, careful selection of the medium must take into account many factors; criteria by which a medium is assessed include the permeability of the clean medium (see Chapter 2, Section 2.1, for definitions of permeability), its particle retention capability and the permeability of the used medium.Serious loss of permeability may follow plugging or blinding of pores in the Filter medium, and can determine the lifetime of the medium if an uneconomic filtration rate results. Permeability and particle retention are dependent on the structure of the medium (see Chapter 2, Section 2.3), but interaction of media structure with the shape and size distribution of the particles challenging the medium is also of crucial importance.
(4)Rhodes, the "glamor girl" of the Dodecanese, with remains of three cities of its own Golden Age (700 to 600 B. c.); (5) Faros, the source of the pure white Parian marble that was the favorite medium of Praxiteles; (6) Delos, center for ages of the Apollo cult; (7) Mykonos, a toy-sized island town that seems rather like a Greek version of Denmark's R0nne, on the island of Bornholm.
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