Mix on exit sprayer

A mix on exit sprayer, comprising:

• a. a body having a first cavity having a first volume;
• b. a tank in which water is adapted to be stored;
• c. a second cavity having a second volume smaller than the first volume and enclosed within the body in which a chemical filled cartridge is adapted to be removably positioned;
• d. a chemical filled cartridge adapted for removeable placement within the second cavity;
• e. a mixing compartment adapted to receive and mix the chemicals from the cartridge with the water from the tank and create a chemical and water mixture;
• f. a first fluid pathway extending from the tank in which the water is adapted to be stored to the mixing compartment;
• g. an electric motor powered by a power source;
• h. a piston driven by the electric motor that is positioned externally to the cartridge, the piston being co-axially aligned with and adapted to linearly move from outside the cartridge into the cartridge at a controlled constant rate and displace chemicals from the cartridge into the mixing compartment;
• i. a spray wand attached to the tank;
• j. a second fluid pathway extending from the mixing compartment to the spray wand;
• and
• k. a pump powered by the electric motor and fluidly coupled solely to the tank and not fluidly coupled to the cartridge and in which water is adapted to be stored and the mixing compartment and adapted for moving the chemical mixture from the mixing compartment through the second fluid pathway and into the spray
• l. an electronic controller that drives the piston is adapted to move at a predetermined, selectively set linear rate of speed, independent of the pump and using the motor-driven piston.