Salinity logic

Discussion in 'Water Parameters and Additives' started by mytank, 14 Oct 2012.

  1. mytank

    mytank

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    Hi guys,

    I just want to check my maths here. A 29.75kg bucket of Aquavito Salinity salt says it will give me 225 Us gallons which is 851.71l of salt water at 1.026 salinity.

    I extrapolate that to try get to some meaningfull numbers for my drums. Let's use 100l and 200l.

    If my calculations are correct:

    1kg of salt should give me 28.6l of salt water at 1.026. That's 851.71l (for the entire bucket of salt) / 29.75kgs gives me the value above.

    If that's the case 100l / 28.6l = 3.5kgs of salt ... for 100l

    For 200l = 7kgs of salt.

    Now I know temp etc plays a role in salinty but for now let's assume all parameters are right and we simply using maths to get to some numbers.

    Would appreciate some logic check here.
     
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  3. ScottK

    ScottK

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    Your maths look good. You need just under 35 grams of salt per liter of water you want to make.
     
  4. mytank

    mytank Thread Starter

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    Thank you @ScottK is that rating just for the Seachem Salinity salt or salt in general?
     
    Last edited by a moderator: 26 Nov 2015
  5. Nemos Janitor

    Nemos Janitor

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    A Salinity of 35 ( used to be considered a weight ratio)

    So 35g salt to a litre is close. It also depends on the salt mix. Wet/damp mixes mix slightly lower salinity than dry mixes. It is a very good starting point when making up batches of salt water.

    When reading instructions on salt bags/buckets etc, try and understand that most give instructions to mix to a SG of 1.025. This is assuming that the mixer is using a hydrometer. If you mix to 1.025 with a refractometer you will use more salt due to the difference in temperature that a hydrometer and refractometers are calibrated at.

    This leads aquarists into confusion when mixing to weight and not getting the expected volume of mixed salt water to a SG 1.025 at 20c when checked with a refractometer.
     
    Last edited: 14 Oct 2012
  6. mytank

    mytank Thread Starter

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    thank you! I will use the guide lines and constantly test
     
  7. carlosdeandrade

    carlosdeandrade

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