pH Question ?

Discussion in 'General Discussions and Advice' started by Warr7207, 12 Feb 2009.

  1. Warr7207

    Warr7207

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    Is there any way that pH will increase naturally over time ?

    For the last 8 months I have been running my tank at a pH of 8 and having to supplement with kalk via RO top up to keep it there. This is been due to the high alk created by the CaRx.

    Over the last month I have noticed my pH slowly climbing even though I have stopped dosing kalk.

    The only thing I think could have an influence is my algae scrubber.

    Could this be the cause ?

    The pH is now up to 8.3
     
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  3. Shaun

    Shaun Retired Moderator

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  4. Mike

    Mike Retired Moderator

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    Many reefers reverse cycle their sump lighting as it keeps ph steady as PH seems to drop off over night when the tank lights are off, so perhaps your algae scrubber is of some use after all.
     
  5. jacquesb

    jacquesb Retired Moderator

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    Warr - I cannot think that it will ever INCREASE automagically. I can tell you though that as detritus accummulates, and gets broken down, and also if there is far too much carbon-dioxide in the water, the pH will decrease "automagically" caused by the acids resulting from detritus breaking down, and from the cabon dioxide..... Also - if one somehow "feeds" too much oxygen into the tank, the pH can maybe increase, as the oxygen molecules bind with calsium to form calcium-carbonate, which does actually increase the pH as well....
     
  6. Warr7207

    Warr7207 Thread Starter

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    Definitely not a calibration problem as I have checked pH reading against Seachem test kit.
     
  7. Shaun

    Shaun Retired Moderator

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    I had the same problem and then tested the probe and it was out.
     
  8. Warr7207

    Warr7207 Thread Starter

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    So what else you reckon could increase it ?

    Water changes ?
     
  9. dallasg

    dallasg Moderator MASA Contributor

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    Water supply, test ur RO water
    Posted via Mobile Device
     
  10. Warr7207

    Warr7207 Thread Starter

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    Could be an idea, but for the RO to effect the tank by this much, I reckon the RO water would need to at a pH of 9, I am sure I would have noticed if my bath water was this caustic :whistling:
     
  11. dallasg

    dallasg Moderator MASA Contributor

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    That's still drinkable :)
    Posted via Mobile Device
     
  12. Warr7207

    Warr7207 Thread Starter

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    Yeah, but with the amount of chlorine in tap water doubtful ;)
     
  13. dallasg

    dallasg Moderator MASA Contributor

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    Our water, rand water, is the best in the world
    Posted via Mobile Device
     
  14. sunburst

    sunburst

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    Yes to all:)
    CO2 will accelerate the growth of algae s, which is consumed (CO2) and Oxygen released. The end result will be a raised pH.
     
  15. Warr7207

    Warr7207 Thread Starter

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    Wow, so that is a great benefit of the algae scrubber
     
  16. dallasg

    dallasg Moderator MASA Contributor

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    just have to clean scrubber a little more :)
    but i would still test the water

    as well as take a ph reading just before lights on and just after lights of and see if there is a diff
     
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