Brian and Marilyn,
Sorry it took me so long to respond to your question. Had a
little computer crash.
I get my anhydrous granular citric acid (food grade, though this
is not at all essential) from a little chemical company that does
mostly pool chemical supplies. I am not certain why they carry
it. They must serve the a niche in the food industry. It comes
in 50 lb. bags and costs $1.50 per pound. They don't carry it in
smaller quantities. However, I believe you can get it at some
pharmacies. I asked what a lesser grade would cost, and the
price they quoted was actually more than the food grade. You
probably can get your chemical company to order it for you. It
is produced by Haarmann & Reimer Corp. out of Elkhart, IN. I buy
the bag, split it up and sell it to friends at cost. Makes it
less of an investment for all of us. There is no problem with
storing (just needs to be kept from moisture) it if you wish to
have a lifetime supply.
It takes about 2 to 3 cups per half crockpot (medium size
crockpot). It is very safe to use, which is why I am using it,
and it seems to last a long time. I don't worry about the
splatters when I quench in it, and I don't worry about breathing
it. I wouldn't go out of my way to inhale it, but I don't get so
up tight about the fumes, fan, corrosion . . .
Good luck finding some, and Brian, thanks for the depletion