reef crystals VS. kent sea salt

[eli@fijireefrock.com]

i have tried instant ocean and kent sea salt but never reef crystals [img]smile.gif[/img]
as you all know i am starting over for my reef i think i might change the salt brand i could get reef crystals for a 100$/200gln pail.
anyone using it what is the difference any info. would be thankfull :confused:
(total death in my tank nothing survived as i tried to save some corals)