Water change and alkalinity

Discussion in 'Among The Reef' started by Brandonsegula, Dec 6, 2017 at 10:21 PM.

  1. Brandonsegula

    Brandonsegula Well-Known Member

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    Just did a water change. Yesterday alk was at 8.9 after water change today 7.8???? How come the drop?
     
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  2. awais98

    awais98 Well-Known Member

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    Most likely the alk of the tank and the new water was different.
    Next time check the Alk of both before changing it
     
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  3. jsker

    jsker Reefing is all about the adventure R2R Supporter R2R Excellence Award Reef Squad Leader Build Thread Contributor Article Contributor Partner Member 2018

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    salts tend to give a higher readings after a water change. I usually wait a day or two before I test and I also test before the water change. Testing this way you can see how much your alk is depleted before water changes and what my need to dose.:)
     
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  4. Brandonsegula

    Brandonsegula Well-Known Member

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    It’s just strange to me that yesterday my water read 8.9 and after water change 7.8 I’m just confused on how that could be you know? My alk doses at 1 am and stop at 5 am I’m going to check before work and then after again.
     
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  5. awais98

    awais98 Well-Known Member

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    And thy much variation is not good for coral growth
     
  6. jsker

    jsker Reefing is all about the adventure R2R Supporter R2R Excellence Award Reef Squad Leader Build Thread Contributor Article Contributor Partner Member 2018

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    What set kit are you using?
     
  7. Brandonsegula

    Brandonsegula Well-Known Member

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    Salifert
     
  8. Brandonsegula

    Brandonsegula Well-Known Member

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    I just hope nothing happens to my corals till I figure this out.
     
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  9. Brandonsegula

    Brandonsegula Well-Known Member

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    Will not letting the water mix long enough cause this
     
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  10. Brandonsegula

    Brandonsegula Well-Known Member

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  11. Brandonsegula

    Brandonsegula Well-Known Member

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    I figured it out everyone. But dos motors are completely dead. After 3 weeks they just are dead now. I put my jebao doser back on. Hopefully it won’t shock anything by dosing the amounts needed
     
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  12. jsker

    jsker Reefing is all about the adventure R2R Supporter R2R Excellence Award Reef Squad Leader Build Thread Contributor Article Contributor Partner Member 2018

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    The Jebao doser are pretty good, that is what I am using.

    The great salt debates that have been had:) From what I have pull from reading thread and information posted manufacturers tend to add more Alk, Ca, Mg then what is on the label. My thinking is it is for the individuals that are not dosing and if the person not dosing is making there timely water changes with a light coral load they will be fine and have growth. When I started dosing to get my parameters more consistent I found that I need a salt with lower parameters and some other benefits.
     
  13. Brandonsegula

    Brandonsegula Well-Known Member

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  14. Waters

    Waters "...in perfect isolation, here behind my wall." R2R Supporter

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    I have had strange issues with my CA Dos motor also where it stops working at appears dead. Try unplugging the power and Aquabus cable and plugging it back in....that always gets mine working again. Not sure what the issue is though.
     
  15. Brandonsegula

    Brandonsegula Well-Known Member

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    I actually took the whole motor out and and put it back in and works again. I contacted Neptune. They were no help.
     
  16. Waters

    Waters "...in perfect isolation, here behind my wall." R2R Supporter

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    That is surprising they weren't able to help.....they have already shipped me one replacement motor after troubleshooting. Is your DOS out of warranty?
     
  17. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor

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    I see you have the answer, but I'll give a few comments for future readers:

    The mixing time can't explain it, unless the time was so short that there was a lot of solid white salt mix still sitting on the bottom.

    There can be many explanations, including testing errors (way more common than most people assume), lower alk in the new salt mix (some are below your target), and increased calcification by corals or abiotic precipitation in the tank after the change.

    For example, if corals were suffering for lack of something and the new salt water brought it in, coral uptake of calcium and alkalinity might have increased.
     
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