Thanks Matt, using his calculator though it shows my co2 at 35ppm which is too high; my phosphates are between .25-.5 so that shouldn't be throwing off the values; I might have my water officially tested for hardness so I can get an official result; Thanks for your help, Jeff A. _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member