I was looking at various sprayers and was considering the Lesco space saver (200g) for a starter rig. I intend to do primarily lawn herbicide/insecticide/and some liquid fertilization as necessary. However, I am concerned that I may need to set up a seperate tank and sprayer for herbicide usage to prevent phyto-toxicitity problems. Without buying two sprayers...(which I will eventually do), any suggestions. I will probably use backpack sprayer for smaller jobs but curious as to what others are doing??