Ph swing ranges

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

  1. L/B Block

    L/B Block Supporting Member

    Read the same...

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  2. Ibn

    Ibn Supporting Member

    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

    Good to know-thanks!

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  4. rygh

    rygh Supporting Member

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

    daddio Supporting Member

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

    capescuba Supporting Member

    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 Supporting Member

    8.3 - 8.4
  8. rygh

    rygh Supporting Member

    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

    How much are you dosing?
  10. capescuba

    capescuba Supporting Member

    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

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

    daddio Supporting Member

    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 Supporting Member

    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

    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

    Whats you Alk level ?
  16. capescuba

    capescuba Supporting Member

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

    JVU Supporting Member

    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 Supporting Member

    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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