Manufactured with the ability to pass small abrasive particles without damage to the pump assembly, this sprayer is ideal for use with chemicals in wettable powder form, as well as liquid formulations and bleach solutions. The handy backpack design allows you to move about freely while reducing user fatigue. Padded shoulder straps/waist belt and an ergonomic handle ensure comfortable use over extended periods of operation. Solo 475-101 4-Gallon Backpack Sprayer with Diaphragm Pump