Okay makes sense ! I just does Neo nitro , does Up to 2ppm, salifert test kit is reading 2ppm. Dosed another 1 ppm today, will eventually get it to 5 ppm. I am attending my first frag swap next weekend here in Houston, hope to pick up hammers for a hammer island Im in the process of and torches ! Keep up with my build thread if you guys want to see the process !I paid just under $30 for the 5lb bag of reagent grade sodium nitrate that I just got in the mail a day or two ago. The only 5lb bag I see on Amazon for about $15 is industrial grade. Make sure whatever you get is food or reagent grade to reduce the odds of contaminants.