A backpack sprayer having a tank with a filling opening at the top thereof and a pressure chamber therein is provided with filtering apparatus for preventing particles in the fluid in the tank from entering an inlet port of the pressure chamber when suction generated by a pump causes fluid in the tank to flow through the inlet port into the pressure chamber. Pressurized fluid can flow through an outlet port from the pressure chamber to a nozzle, via a hose in communication with the outlet port. The filtering apparatus is provided by a filter in a frame removably captured in a fixture projecting outwardly from the outside of the pressure chamber on opposite sides of the inlet port. A handle extends from the frame upwardly along the outside of the pressure chamber a sufficient distance to be accessed manually by an operator through the filling opening of the tank.