I use coralife and works great, no issues at all, great salt!
I mostly used it in the begining cause I buy it by the 150g bucket, but once I used it for a while I found it works great, so I stick to coralife now.
Do a search on instant ocean salt and make sure no issues with it before you start using it, thats what i would do.
It does make a difference what type of salt you get, do your homework.
I remember seeing some posts about having issues with IO, but I have never used it, I have not had a reason to switch to anything else, coralife works great.
Hope this helps!