Abstract: A chemical mixing apparatus has a mixing tank having an inlet and an outlet, means for introducing a liquid into the mixing tank, and a tubular conveyor assembly having a first end and a second end. The second end of the conveyor assembly is sealably connected to the inlet of the mixing tank. A portable hopper having a sealable inlet and a sealable discharge conduit is detachably and sealably connected to the first end of the conveyor assembly such that a solid chemical contained in the chemical storage chamber of the portable hopper may be transported within the portable hopper from a remote location and conveyed from the portable hopper to the mixing tank without exposing the area surrounding the mixing tank to the solid chemical.