Salt

[DanG]

Here's the thread on RC that has measurements from all the major salt manufacturers.

http://www.reefcentral.com/forums/sh...5&pagenumber=1

Keep in mind, while they shoot for specific numbers, you will find differences within the same brand if they're from a different batch.

That being said, I switched from IO to Seachem Reef Salt because I was tired of having to buffer my IO all the time.