The Easiest Hose End Sprayer You Will Ever Use Is By Fertilome. No pre-mixing needed. 3 Easy steps. Fill bottle with chemical and spreader sticker. Do not delute the chemical as the sprayer will do it for you. Set dial to the concentration according to the chemical package directions. Set the dial for 2 and the sprayer will deliver two Tablespoons per gallon of water. Spray with the diverter on in an up or down arch. Or take the diverter off to reach high into trees up to 30 ft.. 16 mixing ratios available. Built in anti-Siphon prevents backflow. Operates on water pressure 40 to 60 PSI. You will love this sprayer. It's the best I've used.