Quote: I can't think of any reason, but I'll ask when I call the mfg. FWIW, the directions for SMZ-Med 454 and Sulmet Powder are the same, which makes sense since they are both 100% sodium sulfamethazine.
-Kathy
@ChickenCanoe , DH has a theory... When make a large batch, people would be tempted to just dump the bag into 128 gallons, and he thinks that the powder might not mix as sell that way. By putting the whole bag in one gallon one can shake, stir, whatever to ensure all the powder dissolves.
-Kathy