Sodium Nitrate

[coolhandgoose]

Does anyone know where to get sodium nitrate from in Calgary? I'm running an ultra low nutrient system with bio pellets and thinking that this may be contributing to my Dino problem. I've heard of people raising their nitrate levels to about 2-3ppm helps to get rid of them. Figured it can't hurt. Failing a spot to find sodium nitrate how about potassium nitrate (saltpeter)?