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