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