Mike,

I could be wrong on this, and I am sure people will argue and take issue with what I am going to say, but why take a chance? why spend thousands of dollars on building a gorgeous reef and then add something that is food grade instead of something that is closer to a lab grade? I don't have any type of assays that say, for instance, kent super buffer is more pure than Arm & Hammer Washing Soda, but well, I guess you get my point... there are companies out there like SeaChem that will make it a point to show the quality of their ingredients...

I have been thinking the same thing as you, I am tired of it too, but I am hesitant, and would like to hear some really good points on why it is ok to use food grade materials.