Necro'ing this thread - I know, but wanted to add my $0.02 for those looking into this in the future.
To calculate ppm, and dosage of sodium nitrate -
EX.
tank gallonage 200 gallons, specific gravity of water 1.026.
Sodium nitrate is 72.952% as NO3, typical assay is 99.5 on any grade.
454 grams per pound.
calculation would be:
1 gram NaNO3 x assay material (.995) x molecular weight by % of NO3 (.72952)
divided by
weight of total system volume in grams (1.026 x 8.34 x 200gallon volume x 454 grams per pound)
take this result and multiply by 1,000,000. That is how much nitrate you will be adding (in PPM) on a per gram basis.
In this example, you would be adding .934 PPM of NO3 per gram of material added.
Adding to this for simplicity, at the same specific gravity level but a different system volume, your addition of sodium nitrate scales linearly.
100 gallon system, 1 gram of sodium nitrate - 1.86 ppm NO3
50 gallon system, 1 gram of sodium nitrate - 3.74 ppm NO3
400 gallon system, 1 gram of sodium nitrate - 0.47 ppm NO3
-C
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Colton Meng
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