Filtering media comprised of perlite, namely, expanded volcanic glass in porous granular form for use as a filtering media in commercial and industrial storm water filters; and filtering media comprised of perlite that is coated with an active media to attract phosphorus, namely, expanded volcanic glass in porous granular form for use as a filtering media in commercial and industrial storm water filters

'activ':38 'attract':41 'coat':35 'commerci':21,58 'compris':3,30 'expand':7,44 'filter':1,18,26,28,55,63 'form':13,50 'glass':9,46 'granular':12,49 'industri':23,60 'media':2,19,29,39,56 'name':6,43 'perlit':5,32 'phosphorus':42 'porous':11,48 'storm':24,61 'use':15,52 'volcan':8,45 'water':25,62

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