finding total gal. by adding salt

joe_09(z7 ny)June 16, 2013

does anybody have a formula to find total gal of water in a pond by adding lbs of salt and measuring the specific gravity

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chas045(7b)

Nice thought, but I believe a hygrometer would be too insensitive to detect a useful value for you. Admittedly, I have never understood why some people add any salt to ponds. However, I assume that the added concentration would be far less than ocean levels.

Normal saline which is essentially ocean concentration is 0.9% NaCl. That is 0.9 grams in 100 ml of water. That ocean concentration has a sp. gr. of 1.0046. If, for example, you were to add one tenth ocean salt concentration, that is 0.09 g/100ml, I believe the change from pure water would be from 1.0000 to 1.0005. That would not even be on the scale of a hygrometer. Twice that conc would be 1.001 or barely readable. You would do much better by math. Now, if you have a friend who works in a clinical lab like I used to do, you could get an accurate sodium reading if your friend was willing to slip a sample in. Not very likely I suspect.

    Bookmark   June 16, 2013 at 10:17PM
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frankielynnsie(7B)

Do you want to do this because your pond is such an irregular shape and depth that it makes it difficult to get exact gallons?

    Bookmark   June 17, 2013 at 1:02PM
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joe_09(z7 ny)

yes i have an hour glass shape pond.what i was thinking if i added 160 lbs. of salt and it brought the sp. gr. to 1.003,how many gal of water would there be.

    Bookmark   June 17, 2013 at 6:40PM
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3148markc

Check out the Marine section of your LFS or online. You can buy Hydrometers that you drop water on then it's like a spy glass you look through and it tells you the Specific gravity. They work very well with low levels too. I think there about ã50 to buy but are very accurate.

    Bookmark   June 19, 2013 at 2:31AM
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joe_09(z7 ny)

i found a formula and will try it.

Vol. of water=120 x lbs of salt /salinity
i have a hydrometer and will let you know how i make out.

    Bookmark   June 19, 2013 at 7:47AM
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