Does anyone know of a reliable mail-order(or internet) chemical supply company? I need Potassium Nitrate, Calcium Nitrate, Potassium dihydrogen phosphate, Magnesium sulphate, EDTA iron, Manganous sulphate, Boric acid, Copper sulphate, Ammonium molybdate, and Zinc sulphate. They are for a science project involving hydroponics, just incase you were wondering.

Go to a local pharmacy or hydroponics store.