BRS and twopartsolution are the same guys. They only sold chemicals when they started then expanded with a lot of other stuff hence the name change.
As far as their CaCl is concerned this is from their website (see question #4):
http://www.bulkreefsupply.com/faq.php?cID=1#18
You can also ask them directly in their sponsor forum. I would also give littlesilvermax a shout in his Chemaster sponsor forum as well. I've purchased from both and have had positive experiences from both places.