| http://www.w3.org/ns/prov#value | - It is preferred that a membrane, having fine through pores having an average pore size of 0.05 to 2.0 ??m, especially 0.08 to 0.8 ??m, which are distributed substantially uniformly on the surfaces of the membrane, be used and the water permeability of the membrane be at least 3 l/m2 hr mmHg.
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