Just thought I'd pass along this link to a really good salt calculator. While Chuck's calc is good it doesn't have a large database of salts for use. http://www.hal-pc.org/~menendez/hydrocal.html Happy mixing, Greg _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo.cgi/aquatic-plants