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RE: substitute for KNO3

You can safely substiute sodium nitrate, NaNO3, also known as
 chile saltpeter, but NaNO3 is also an effective oxidant and may
 be regulated just like KNO3.  it is also possible to use Ca(NO3)2 or Mg(NO3)2 without raising the GH significantly and this would probably be a good option.
hope this helps