Where could i buy a potassium nitrate in philippines?

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Answers:
Potassium Nitrate? It's an oxidizer and as is fairly common knowledge it's one of the main ingredients in gunpowder. So you might find it difficult to buy any more than a small amount, seeing as it's used in home-made bombs... I suggest you try a gardening shop. But you might have to show ID or something. Hard to say -- it depends on what the current regulations are there.

You might have to find a different source for nitrates if you need it only for plants.