Starting materials:

   10    litres    ice cold H2O
 2500    grams     KCl
 2850    grams     NaNO3

Distilled H2O and anhydrous KCl/NaNO3 are recommended.




Heat up the H2O and stir in the KCl and NaNO3.

Metathesis reaction:

  2500g KCl + 2850g NaNO3  <-->  3390g KNO3 + 1960g NaCl

Solution concentration(grams per 100ml H2O):

  KCl-25.00  KNO3-33.90  NaCl-19.60  NaNO3-28.5




Chill solution to 0C.  2060g KNO3 will crystallize out using
1519g KCl and 1732g NaNO3 in the conversion.  Filter out KNO3
and set aside.

Solution concentration(grams per 100ml H2O):

  KCl-9.81  KNO3-13.30  NaCl-19.60  NaNO3-11.18




Boil solution down to 40% of its original volume.  Filter and
discard the NaCl that precipitates.  Add to solution 10% of
its volume of H2O and stir.  Chill to 0C.  Filter out KNO3 and
set aside.  Repeat this cycle to get remaining KNO3.