Ok, basically, it means do you want to raise:
1. Nitrogen levels by n ppm, or
2. Nitrate levels by n ppm.
For case 1 use factor 0.25. For case 2, use factor 0.05.
Nitrate equivalent simply means you want to use NO3 instead of N as a indicator to determine how much of the product you want to use.
So in your case you should be dosing 0.05*15*10 ml of Seachem Nitrogen to raise the equivalent of 10ppm of Nitrate.
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