I've been using Instant Ocean Reef Crystals until now (because it's the cheapest reef grade salt I've found and seems to do fine), but a good friend (who has an amazing reef) recommended I use an evaporated salt like Red Sea Coral Pro. I'm thinking I'll give his method a try since he's definitely a guy I'd love to copy in this hobby, but I'm curious to know if anyone has compared these (or similar salts)? Why are evaporated salts better? I confess I don't know much about chemistry, so anyone who can dumb this issue down for me would be greatly appreciated. 
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