I am using a Hagen KH/DH test kit. For GH each drop of reagent represents 20ppm and for KH each drop represents 10ppm. Is there anything else I should be using for a finer scale? Thanks Andre _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo.cgi/aquatic-plants