AJ,you want agricultural grade, I was just told the stuff for pool filtering has chemicals in it...
This go-round, I'm not going to take any chances and see if something I'm not sure works, works. The last time, it took only a few days before the plants were hurt too badly to recover. Now, if DE works as a preventive measure, something I can sift onto the dirt or whatever, I'm game. But for the present, I simply want to kill them as quickly as possible, though I would not mind them suffering before they give up the ghost.
Mike