"And here I thought all these years that potash was made from iguano from Chile!" Guano from Chile is sodium nitrate, no potassium involved. I apologize for goofin' it before , but over here H2SO4 is sulphuric acid (in common usage mruiatic acid) and HCl is chlorhidric acid. As Jim Lykos said before, an international confusion. Sorry Regards Alberto _________________________________________________________________ MSN Amor: busca tu ½ naranja http://latam.msn.com/amor/