OK, I have been what we call "sprayer poor" here in the south. "Anything + Poor" meaning too many.... a southern thing I guess. Anyways, I've had portable tank sprayers and hose end sprayers for each class of chemicals.... RoundUp, crabgrass killer, lawn weed killer, lawn insecticides, ornamental insecticides, fungicides, and several types of feeders. So I've been keeping these separate sprayers for everything, so this way I do not have to worry about any unwanted leftover residues from one chemical to another. But now as I have had several of them start to go south on me in sucessive order, I'm beginning to ask myself.... "is all this really that friggin necessary???" So how many of you have separate stuff for everything and how many of you just use some sort of "flush-out" proceedures when changing chemicals?