Ron,
Have asked this question on RC's chemistry forum and Randy replied with the following threads and articles....
"The new Seachem salt mix is seemingly a big improvement over the old Seachem mix, which had greatly elevated borate:
The Composition Of Several Synthetic Seawater Mixes
http://web.archive.org/web/200012150.../1/default.asp
Boron in a Reef Tank
http://www.advancedaquarist.com/issues/dec2002/chem.htm
The new Seachem mix is lower, but still has higher than NSW borate (apparently).
I've battled the Seachem folks here in this forum on their borate alkalinity kit, which I do not recommend:
http://reefcentral.com/forums/showth...hreadid=756622
The Seachem Borate Alkalinity Test Kit
http://www.advancedaquarist.com/issu...e2003/chem.htm
Finally, Phosguard releases aluminum:
Aluminum and aluminum-based phosphate binders
http://www.advancedaquarist.com/issu...y2003/chem.htm
and a follow up discussion with Seachem about it and some new data:
New Aluminum Release Data for Phosguard
http://reefcentral.com/forums/showth...hreadid=219105"
Have read a few of the articles and threads, but not all of them yet. Was thinking about Seachem products as an alternative to Kent's, but now I'm not so sure.
Folks on RC's thread about Kent's low alk have been talking up a storm about Tropic Marin salt, but don't know what other products they produce. If you haven't already read it, here's RC's continuing thread on the low alk Kent salt issue for further info....
http://reefcentral.com/forums/showth...5&pagenumber=1