Has anyone constructed one of these? pH controller under $15. http://www.lce.org/equipment/phmeter/phoper.html from this thread, http://www.plantedtank.net/forum/viewtopic.php?p=37618#37618 _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo.cgi/aquatic-plants