In the analysis given on fertilizers/supplements such as those in garden stores, is the breakdown by mass or volume? For instance, I just bought a supplement containing 4.60% Fe. Does this mean 46000 mg/L, or 46000 cc/L? As long as I'm here... 0.2 mg/L is the Fe level the PMDD shoots for, right? Thanx much, Brian T. Forsythe crom at cris_com Every picture is not worth a thousand words; besides, I think I'd rather have the thousand words.