Now What??

Discussion in 'Water Parameters and Additives' started by Alan, 5 Jul 2011.

  1. Alan

    Alan Admin MASA Contributor

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    Well as some know i have just redone my DT after a sponge infestation, so i decided to check my salinity which i do from time to time, about once a year on average. Used a friends refractometer and found my salinity down at 1021 so added salt to my top ups which in winter are about 20 - 30L per day for a few weeks. Took a reading a couple of days ago and it was 1022, damn still a long way to go. Visited another friend with a refractometer today and it gave me 1026 and i haven't added any salt in between tests. Both refractometers are new, both were calibrated at the time of the test and both these guys run their DT's at 1025 and the live stock in both are thriving. Do i now have to find a 3rd refractometer to check against.
     
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  3. butcherman

    butcherman Moderator MASA Contributor

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    Did you calibrate the refratometers personally alan?
     
    Last edited: 5 Jul 2011
  4. KeeganP

    KeeganP

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    :whistling: did you add more LR?
     
  5. seank

    seank

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    Read somewhere that you get refractometers for freshwater- dunno if I read it right, maybe you used a wrong one
     
  6. butcherman

    butcherman Moderator MASA Contributor

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    i know the vet uses some to measure an aminals urine
     
  7. Alan

    Alan Thread Starter Admin MASA Contributor

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    No, but both these guys are experianced reefers.

    No, couldnt work that out for a minute.

    LOL, as far as i know both a SW refractometers.
     
  8. butcherman

    butcherman Moderator MASA Contributor

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    I callibrate mine everytime i use it with RO water. even the slightes bump can put it out.
     
  9. KeeganP

    KeeganP

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    I think give it one more test and then take it from there...
     
  10. butcherman

    butcherman Moderator MASA Contributor

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    when in doubt check with a hydrometer :yeahdude:
     
  11. KeeganP

    KeeganP

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    :lol: I was going to suggest that, But dont wana risk getting banned :lol:
     
  12. lIghty

    lIghty

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    Calibrate and test both together.
     
  13. Tobes

    Tobes Retired Moderator

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    I agree, very sensitive, and if not temp compensated, RO must be same temp as salt water. But Alan knows that already :p
     
  14. viper357

    viper357 Admin MASA Contributor

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    When you got the higher reading, how was the water placed onto the refractometer? If using a syringe or dropper or whatever, was it rinsed with RO and dried first? If it wasn't rinsed from the previous time it was used, the water would have evaporated and left the salt residue behind inside the dropper, which could affect the reading.
     
  15. Nemos Janitor

    Nemos Janitor

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    and the calibration.
     
    Last edited: 5 Jul 2011
  16. TheWaterboy

    TheWaterboy Sponsor

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    check if they both automatic temperature compensated
     
  17. Alan

    Alan Thread Starter Admin MASA Contributor

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    Straight from the sample bottle to the lenz of the refractometer, tested 3 times on each. I hear the whole temperature thing but could it account for such a large difference. At the end of the day i didn't expect both to give me the exact same reading but i didn't expect such a large difference.
     
  18. Braco

    Braco

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    this is actually alarming..how do you know which reading to trust..i normally go the the lfs who makes use of a refractometer..
     
  19. rakabos

    rakabos

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    Temp can absolutely make a big difference!
     
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