Just wondering what each of you use to clean out your system. I ran into a slight problem the other night, had to make an emergency 1000 mile round trip and had a nice 1/2 tank of mix still in. Normally I'd just run the mix out on my own yard here and there, (nice nice growth patterns ) then wash it out. My biggest problem with the other night, it had 2 gallons of Chelated - Iron in it. Any thoughts ????