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Thread: what's the real story on this...

  1. #1
    DIY Senior Member DIY's Avatar
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    Dec 2006
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    Florida
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    150

    Default what's the real story on this...

    Through my experiences i have seen it mostly on hot water heaters. Dissimilar metals. that over time cause a green whitish build up around two fittings of dissimilar metals that have been threaded ,or sweated together. When it is touched it breaks up like powder. I have asked about this and the answer i get is use brass nipples instead of die electric nipples that some HWH's come with for connecting the hot and cold water lines.

    My other question is: Is this build up of the funky green whitish stuff bad for the connection that can cause leaks and/or the pipe metal to break down etc.?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Cave Creek, Arizona
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    25,633

    Default residue

    It is residue from a leak. The leak was just so slight that the water evaporated and left the minerals behind.

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