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公开(公告)号：US3625182A
公开(公告)日：1971-12-07
申请号：US3625182D
申请日：1970-04-23
Applicant: GAF CORP
Inventor： WILLIAMS EARL PIERCE , FIELD NATHAN DAVID
CPC classification number: A01K63/04
Abstract: A method of treating waters so as to render the same suitable for rearing trout fry and similar fry of fresh water fish comprising passing the waters through and in contact with a porous granular or porous bead form of a water-insoluble, crosslinked vinylpyrrolidone polymer.
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