follyatsettle Posted May 25, 2020 Share Posted May 25, 2020 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? Link to comment Share on other sites More sharing options...
Temp Posted May 25, 2020 Share Posted May 25, 2020 Several websites claim that one advantage of EPDM is the run off contains no harmful chemicals... https://www.rubber4roofs.co.uk/blog/8-reasons-why-epdm-rubber-roofing-is-the-most-eco-friendly-roofing-system/ Have you got wire leaf guards on the down pipes? Perhaps something like a rat got in the tank? Link to comment Share on other sites More sharing options...
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