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Thread: Question for a chemist

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    Question for a chemist

    Why is reverse osmosis water so hard on copper pipes? Does it make acid while it is leaching the metal out of it?

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    Patrick_B's Avatar
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    Re: Question for a chemist

    RO water is aggressive because there is very little of anything in it mineral, or buffer wise. Roughly, waters are either scaling or corrosive. If they contain little to nothing, they will dissolve many things they come in contact with. Metal or mineral. Water is always trying to reach equalibrium by dissolving or depositing something. It won't create acid, but some RO water is on the acid side, say 6.0-6.5 depending on how far it is processed.
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    Mod Squad pooldv's Avatar
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    Re: Question for a chemist

    Welcome to TFP!
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    Re: Question for a chemist

    Thank you very much. Question came up over on solarpaneltalk I didn't quite know how to answer it. I just know it's very hard on copper pipe.

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    Mod Squad pooldv's Avatar
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    Re: Question for a chemist

    It is mostly about PH, pH below 7.0 is corrosive to copper and pH above 7.2 is not.
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    Patrick_B's Avatar
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    Re: Question for a chemist

    RO is agressive to most minerals and most metals. Copper is highly suceptible to some things like Chlorine, and like Aluminum it is also susceptible to elevated pH levels.
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