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Discoloured rainwater


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Recently completed a fairly large flat roofed extension covered with black EPDM rubber.  The rainwater runs off to an existing rainwater harvesting tank.  Since the water from the EPDM roof has been connected the water in the tank has become darker - a sort of blackish yellow.  Perfectly OK for toilets etc but unsightly.  Filters clear.  Is this a consequence of newly installed EPDM and if so does it turn clear in time?

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