I would put as much faith in that LFS results or findings that "filtered" IO salt, as I would in the auto makers resurecting and reintroducing the YUGO car in 2007!
The best salt to use,um is well um ah,um lets see now.......Hey, I'll make you a deal. If you can tell me what is the best car I'll divulge what is the best salt. Thats an offer you can't refuse. I use I/O, but that does not necessarily mean its the best either, but I like it and it does what it needs to do and it is reasonably priced and easily obtained.