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specific gravity vs percentage

Discussion in 'Advance Water Quality' started by ampthelamp, Jun 19, 2013.

  1. ampthelamp

    ampthelamp Ampthelamp

    Joined:
    May 14, 2013
    Location:
    Las Vegas, NV
    I have a hydrometer that measures specific gravity and salinity in ppt. What measure will yield a .3% solution? Thanks
     
  2. Ichthius

    Ichthius Professional Breeder

    Joined:
    Dec 11, 2008
    Location:
    Eugene Oregon
    .3%=3ppt hard to read on most hydrometers. Get a meter or refractometer.
     
  3. ampthelamp

    ampthelamp Ampthelamp

    Joined:
    May 14, 2013
    Location:
    Las Vegas, NV
    Yes, it is very hard to read. Thank you very much for your input, you've reduced my stress greatly.
     
  4. ampthelamp

    ampthelamp Ampthelamp

    Joined:
    May 14, 2013
    Location:
    Las Vegas, NV
    OK, so I got a brilliant idea: I took a gallon of tap water and measured the specific gravity; it read barely above 1 as expected. Then I added 3 tablespoons of salt and measured the specific gravity again - it was almost 19 ppt or 1.014. Is it reasonable to assume that my old, cheap hydrometer has a systematic error of that magnitude? I was intending to add salt to match that reading on the hydrometer. It is too late to go to the store and buy a more accurate hydrometer. thanks in advance for your help.
     
  5. Maximus297759

    Maximus297759 Active Member

    Joined:
    Mar 5, 2014
    Location:
    Lousisana
    So what would good salt level to maintain with oldfish. I have saltwater fish also so I have a good refractor. I think I checked my salt was like 1.001 not much. DOes 3ppm mean 1.003?
     
  6. WaterToad

    WaterToad Active Member

    Joined:
    Mar 2, 2015
    Location:
    CA
    It's an old post but i'll chime in.

    It's not ppm but rather ( parts per thousand). For a therapeutic level i keep my tank at 1/2 level teaspoon per gallon. It wont even read at this level unless you have a digital meter.

    1 level teaspoon per gallon will give you about 1%
    2 level teaspoons per gallon will give you about 2%
    3 level teaspoons per gallon will give you about 3%

    This is all with the rock type salts and not the granular salt.

    salt softens the water for the fish. reduces stress..boosts there immune system...increases there slimecoat.
     
  7. High Ranchu

    High Ranchu Professional Breeder

    Joined:
    Oct 6, 2013
    Location:
    Sarasota, Florida
    Its 0.3% not 3%
     
  8. WaterToad

    WaterToad Active Member

    Joined:
    Mar 2, 2015
    Location:
    CA
    It's the same reading. .3 and what i was calling 3% was the same reading. Maybe i was reading the scale wrong. Ok thanks for setting me straight
     
    Last edited: Mar 25, 2015

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