well if there is one problem with synthetics its EDTA it might not hert you but that guy futher down the river from you that gets your hydro wast water might be getting this ...copy and pasted from wikipidia EDTA is in such widespread use that it has emerged as a
persistent organic pollutant.
[22] It degrades to ethylenediaminetriacetic acid, which then cyclizes to the
diketopiperizide, a cumulative, persistent, organic environmental pollutant. An alternative chelating agent with fewer environmental pollution implications is
EDDS.
EDTA exhibits low acute toxicity with
LD[SIZE=-1]50[/SIZE] (rat) of 2.0 – 2.2 g/kg.
[4] It has been found to be both
cytotoxic and weakly
genotoxic in laboratory animals. Oral exposures have been noted to cause reproductive and developmental effects.
[9] The same study by Lanigan
[9] also found that both dermal exposure to EDTA in most cosmetic formulations and inhalation exposure to EDTA in aerosolized cosmetic formulations would produce exposure levels below those seen to be toxic in oral dosing studies....end qoute ..
if you do your home work on it youll find that it wont hert your plants or make them unsafe to smoke but it is a problem none the less ...