86% and Better
As long as you can identify the substance with enough assurance, that it is KNO3 or KH2PO4, it should be okay.
At fertilizer grade, they do not have to be very pure.
Recrystallizing is an easy method, a time or two just to get rid of the junk (and see some of the junk), 17-27 times for high purity.
Anyway, if you need any help let me know I’ll be back in a couple of hours…
God willing and the creek don’t rise… Always kind of seemed the creek ought to be under God’s control… Maybe one of the religious leaders could help me out with this one.
If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.