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Stormwater is collected from the copper roof and passes through bioretention planters and biofiltration swales. These treatment measures reduce the amount of copper in runoff by 88 to 99% and alter its chemistry as it passes through. - See more at: http://coppertalk.ppginteractive.com/2013/05/20/first-results-find-evidence-that-copper-from-roof-runoff-can-be-controlled/#sthash.IgKqIE88.dpuf

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