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Ph swing ranges

Discussion in 'Reef Chemistry' started by L/B Block, Dec 17, 2017.

  1. L/B Block

    L/B Block Supporting Member

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    Read the same...


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  2. Ibn

    Ibn Supporting Member

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    Forgot to address the other part of your question. Most mature tank pH will drift daily with no signs of algal growth and more than respectable growth. Sanjay Joshi is a good example of that with one of the fastest growing SPS tank and his pH ranges from 7.9 - 8.4 daily. pH is one of the least important factor when it comes to reefing.

    Even on the reefs, the pH swings from 8 - 8.3 daily.
     
  3. L/B Block

    L/B Block Supporting Member

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    Good to know-thanks!


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  4. rygh

    rygh BOD

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    Mine is 7.7 to 7.9
    Yes, a bit low.
     
  5. daddio

    daddio Supporting Member

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    How are you so low? I thought you were adding alk/ca with your vinegar?
     
  6. capescuba

    capescuba Supporting Member

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    Mine is hovering right on 8 with vinegar/kalk+2. It was running a little higher at ~ 8.1-8.2 before adding
     
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  7. Tmjvb

    Tmjvb Guest

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    8.3 - 8.4
     
  8. rygh

    rygh BOD

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    Winter means my house is a bit too sealed up. So excess CO2.
    The vinegar dosing drives the PH down.
    I dose Baking soda, not soda ash or baked-baking soda, which also drives the PH down.

    I did run a CO2 scrubber for a while. Pushed the PH up nicely. But media is expensive.

    If it was a priority I would probably switch to Kalk. May someday...
     
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  9. daddio

    daddio Supporting Member

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    How much are you dosing?
     
  10. capescuba

    capescuba Supporting Member

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    I started with your formula 45ml vinegar + 3/4 tsp Kalk+2 + 1g RO and will tweak from here.

    Will test Alk and CA when I get home this evening
     
  11. ashburn2k

    ashburn2k Webmaster

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    mine is 7.4-7.7 everything just growing slow for SPS.
     
  12. daddio

    daddio Supporting Member

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    Cool! You're putting the vinegar into a beaker and then adding the Kalk, Then stirring well and adding that to the ro?
     
  13. itsacrispy

    itsacrispy Guest

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    My pH swings between 7.59 and 8.1 throughout the day. What's odd is that my Calcium is very high, over 500ppm, but my pH didn't show it.
     
  14. capescuba

    capescuba Supporting Member

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    Yes Sir! Actually more "swilling" than "stirring" but there was practically no residue when I added to the RO
     
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  15. Ranjib Dey

    Ranjib Dey Webmaster

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    Whats you Alk level ?
     
  16. capescuba

    capescuba Supporting Member

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    I thought CA came out of saturation at around 450 PPM? I'm no Chemistry major though ...
     
  17. JVU

    JVU BOD

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    Alkalinity (carbonate) is a pH buffer so higher alk reduces the daily pH swing and overall buffers it to a higher level. Other than Ca precipitating with alk and thus reducing the buffer, I don’t know how it otherwise affects pH.


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  18. itsacrispy

    itsacrispy Guest

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    It certainly does, because I just experienced it in my tank :(. Tank was opaque for a couple days until someone suggested I stop with my daily water changes. I did that and overnight the cloudiness disappeared.
     

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