Andy,
I have used Kent marine & Instant Ocean brand salt more than any other brands. Honestly what determines which one I use is who has the better price. My experience is that they are almost identical in terms of their good & bad points.
Really the only low point about either is that they both need higher ca, Alk & mag than what is typically desired for reef aquariums. All of these are easily overcome with proper supplementation. (as you have the means to achieve)
Although not specific to just Kent Marine, this is a pretty good report / comparison on synthetic salts (including kent);
http://www.advancedaquarist.com/2005/12/aafeature1It pointed out that none are identical to natural water but rate kent & I/O pretty highly
Quote from review;
No salt in this study is an accurate simulation of natural sea water. All salts had at least one toxic heavy metal that was far in excess of NSW levels. When all factors are considered, Tropic Marin, Instant Ocean, and Kent Marine score the best, but such a score can not be arrived at without some amount of subjective judgment in evaluating the pertinent factors.For me, I would feel very safe using Kent Marine, rarely have I had problems with it. The only reason I use I/O more frequently is because I typically get it at a lower price.
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