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|   It is not illegal in Canada only controlled.  Mix it with a little diesel fuel and you got yourself a pretty powerful bomb (Oklahoma Bomber) I got mine from a local fresh water fish supply company. They use it in fresh water to grow plants. You will need to sign your life away and I believe can only purchase a pound at a time. Although a pound of KNO3 will last you a long time. If you want really pure KNO3 you can purchase is from a scientific supply company like Fisher Scientific (>99% pure). The amount of KNO3 you will be adding to your tank I am not sure you need the purest form. Last edited by Frogger; 09-22-2017 at 04:23 AM. | 
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|   I used calcium nitrate and it worked well, easy to get and you won't have to worry about a little extra calcium, I ordered mine online though the plant guy. |