potassium nitrate has been illegal in Canada since around 2009 so pure KNO3 isn't an option. i went through this a few months ago and in the end wound up just buying spectracide from amazon.com. it costed a little more due to exchange and shipping but i imagine i won't ever need to replace it.
also, seachem makes nitrate (and phosphorus in case you ever needed it) that can be used in the interim but its far less cost effective than specracide.
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