{TAIL ~ This invention} involves the presence of microvoids in {HEAD ~ the second coating} of the granules to enhance the migration of algaecides contained in the first coating thereby providing increased algicidal activity on the surface of the granules 
{ TAIL ~ This invention } involves the presence of microvoids in { HEAD ~ the second coating } of the granules to enhance the migration of algaecides contained in the first coating thereby providing increased algicidal activity on the surface of the granules
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