PH of RO water

Discussion in 'Water Parameters and Additives' started by Warr7207, 23 Feb 2008.

  1. Warr7207

    Warr7207

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    What is the pH of RO water ? Is it 7 ?
     
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  3. Mike

    Mike Retired Moderator

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    i hadn't thought about that before, it must be 7 as that is the neutral point on the litmus test.
     
  4. Warr7207

    Warr7207 Thread Starter

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    Just getting all my ducks in a row, so I can check all my testing equipment :thumbup:
     
  5. Kanga

    Kanga Retired Moderator MASA Contributor

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    Yip 7 as anything that would make it either alkaline or acidic should have been taken out by the r/o unit
     
  6. Reef Maniac

    Reef Maniac MASA Contributor

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    In theory yes, but in practice no...

    The pH of RO water can be just about anything :) In fact, one should not really bother to test the pH of RO water.

    Hennie
     
  7. neilharris

    neilharris

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    pH of ro water will vary according to the quality of supply water and the quality of the RO unit itself. As a given it should be between 5.5 and 7.

    Point of interest: If you want to raise the pH of a new salt mix. Add an airstone and pump for 24 hours. It will bring it back up to about 8.2/8.3.

    HTH,
    Neil
     
  8. Mekaeel

    Mekaeel Moderator MASA Contributor

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    just my 2c for the newbies.for topups,kalk wasser running through a kalkstirrer or manually added to RO helps raise your ph aswell as your calcium.
     
  9. Kanga

    Kanga Retired Moderator MASA Contributor

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    Hennie/Neil

    Wow, go figure I would never have guessed, ok what would cause the PH to drop or raise the PH in R/O?
    Purely for interest sake:)
     
  10. Warr7207

    Warr7207 Thread Starter

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    Well, well just tested my RO and it is ph is 7.1.

    So not totally neutral.

    Would distilled water be measured at pH 7 ?
     
  11. Mekaeel

    Mekaeel Moderator MASA Contributor

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    are you testing with a ph meter Warr?
     
  12. Warr7207

    Warr7207 Thread Starter

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    Yip
     
  13. Mekaeel

    Mekaeel Moderator MASA Contributor

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    well i personally think that it would not be spot on 7.0 could be a +-
     
  14. Warr7207

    Warr7207 Thread Starter

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    Check the previous posts, RO is not normally 7. It is dependent on the actual water supply
     
  15. Mekaeel

    Mekaeel Moderator MASA Contributor

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    yeah sorry missed that post lol
     
  16. Warr7207

    Warr7207 Thread Starter

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    No problem, mate

    :coolgleamA::coolgleamA::coolgleamA:
     
  17. neilharris

    neilharris

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    Have a read here:
    http://www.purewatersystems.com/ph_topic.php

    Lots of random stuff, but he chemistry part is easily explained.
    HTH,
    Neil
     
  18. Warr7207

    Warr7207 Thread Starter

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    Very nice article

    I reckon it comes down to this quote:

    "Chemically speaking, the extreme purity of BEV water means it has no buffering capacity. This means the addition of very small amounts of an acid or base will cause large effects on pH."

    Source: http://www.purewatersystems.com/ph_topic.php
     
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