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Thread: PH of RO water

  1. #1
    hal401 is offline Junior Member
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    Feb 2011
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    Default PH of RO water

    I recently had hydrotech RO (the current 1240 M model) system installed it pulls water after the water softener; and also purchased a TDS and PH meter.

    It doesn't seem to consist of any mineral cartridge that would make the water harder, yet when I measure the PH of my RO water is approx. 9.5-9.7, while my tap was is around 8.8-9.0 (about a point higher). I thought water was supposed to become more acidic that standard tap water with an RO system. The PH meter seems correct, I have calibrated it with different PH solutions per it's directions.

    The RO water is running through all plastic lines. My TDS is about 7 most times. Any ideas? Is it safe to drink water in the high 9's for PH?

    Thank you.

  2. #2
    Akpsdvan is offline Senior Member
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    Most of the time the ph drops after a RO system and why yours is up.. going to be thinking on that for a bit.
    The TDS should be about 5% of what ever the untreated or water before RO..
    So if the water before the RO is 100 and you are getting a 7, you are where it should be.

    How much water has passed through the RO ?

  3. #3
    Join Date
    Apr 2010
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    Cool

    Quote Originally Posted by hal401
    I recently had hydrotech RO (the current 1240 M model) system installed it pulls water after the water softener; and also purchased a TDS and PH meter.

    It doesn't seem to consist of any mineral cartridge that would make the water harder, yet when I measure the PH of my RO water is approx. 9.5-9.7, while my tap was is around 8.8-9.0 (about a point higher). I thought water was supposed to become more acidic that standard tap water with an RO system. The PH meter seems correct, I have calibrated it with different PH solutions per it's directions.

    The RO water is running through all plastic lines. My TDS is about 7 most times. Any ideas? Is it safe to drink water in the high 9's for PH?

    Thank you.
    pH value of 7 is considered neutral

  4. #4
    hal401 is offline Junior Member
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    Feb 2011
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    Akpsdvan,

    I have been using it for a few months(maybe a 2-3 gallons a day) with I think 2 full flushes at the start.
    Not sure why PH is higher than my tap...any other ideas?

  5. #5
    Akpsdvan is offline Senior Member
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    Any chance that one of the lines is wrong?
    Product water has a higher TDS?

  6. #6
    spiritofscouse is offline Junior Member
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    Mar 2011
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    hi i received my RO yesterday and after flushing it im getting same high ph.My tap water has a ph around 8 - 8.5 and the ro water has a ph of around 9.Did you find out what the problem is?

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