What would cause my salinity to raise?

Discussion in 'Water Chemistry' started by Seabeast, Sep 8, 2009.

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  1. RHorton

    RHorton Pajama Cardinal

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    just curious why do you want to lower it?
     
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  3. Seabeast

    Seabeast Flamingo Tongue

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    Sorry i have a refractometer thats what i had to calibrate. If you guys think i should just keep it there then i will.
     
  4. RHorton

    RHorton Pajama Cardinal

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    1.024 is pretty good, I keep mine at 1.026.
     
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  5. Seabeast

    Seabeast Flamingo Tongue

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    Alright thanks man
     
  6. browntrout

    browntrout Fire Shrimp

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    I keep mine in the middle 1.025 rule of thumb is 1.024-1.026 unless you have a speficic reason for a different sg level.
     
  7. photo-guy

    photo-guy Flamingo Tongue

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    I'm not reading the whole thread. Please forgive me if someone has already said below ...

    Just wanted to say to make sure i) you're testing consistently and ii) using an accurate test.

    I've gone to the glass floating thingies. Got tired of the plastic ones where a tiny little bubble that you cannot see messes up the reading.
     
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  9. reef_guru

    reef_guru Humpback Whale

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    the loss of fresh water
     
  10. photo-guy

    photo-guy Flamingo Tongue

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    Got curious about how much water evaporation it would take to go from a specific gravity of 1.023 to 1.026.

    So did a quick calculation, without thinking, please everyone double check me. I'm ignoring adding the volume of salt back into the equation just cause I'm not that patient, or interested. I'll let you all do the checking and thinking for me please, hehe.

    if at 74F

    1.026 is 35.9ppt salts
    1.023 is 31.9ppt

    then for a 100 gallon system at 1.023 the initial volume before evap is 100, and the salts are 'x'
    x / 100 = 0.0319

    i could have multiplied 100 by 8 pounds per gallon to be more valid, but wouldn't it divide back out at the end anyway? if it bothers anyone, just replace the words 'gallon' with 'pound' and 'volume' with 'weight' and continue.

    after evaporation the remaining volume is 'z'
    x / z = 0.0359

    thus ...

    x = 3.19
    z = 88.9

    loss of 100 - 88.9 = 11 percent evap

    thus it would take about 11% evaporation of water to go from 1.023 to 1.026.

    if anyone wants to refine or correct mistakes, please feel free. won't hurt my feelings. i'm not married to it. just goofing around.
     
    Last edited: Sep 8, 2009
  11. brettwest

    brettwest Spaghetti Worm

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    Just a note,the glass floaty things arent that great either,relying on one of them is what caused all of my crabs to die.
     
  12. photo-guy

    photo-guy Flamingo Tongue

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    You won't get an argument from me. I've got two of them and if one reads 1.023 then the other will read 1.025 :)

    But the plastic thingies? Forget it. They're even worse.

    However, once I settle on using one of the glass thingies, I do find that they are farily reproducible, if not accurate. The one will always read 1.023 and the other always 1.025.

    So I'm pretty happy that I have an accurate test once I've found a good copy. Or, I can correct (e.g. subtract 0.002 off of the one that reads high).

    But I'm talking about the big glass thingies, not the little bitty ones.

    One of the risks about the big glass thingies is if I accidently break it in my tank.
     
    Last edited: Sep 8, 2009