My mistake, I tried the search and got no results. Maybe because of the new server? Anyway, check out these web pages for a start:
<a href="http://www.reefcentral.com/diy/Default.htm" target="_blank">http://www.reefcentral.com/diy/Default.htm</a>
<a href="http://saltaquarium.about.com/index.htm?terms=saltwater" target="_blank">http://saltaquarium.about.com/index.htm?terms=saltwater</a>