I am producing it successfully and I was attached it to this post.
I found out that there are several method to producing industrial salts instead waiting for evaporation like "Vacuum cooling crystallization"
I heat the water to about 50 centigrade and solve the components in to the water and then cooling it slowly to about 0 centigrade.
you know each salt crystals has high speed growth in certain temperature and also has high speed nucleation in other certain temperature.
do you know the potassium tetraoxalate dihydrate curves?