Chemical product dispensing using a fluid drive and return home interface

A dispensing system comprising:

• a fluid drive unit including a housing having an inlet connected to receive a supply of a diluent such that flow of the diluent causes rotation of a rotor positioned within a cavity of the housing of the fluid drive unit, the housing further having an outlet from which the fluid exits the housing and is directed to a reservoir,
• wherein a rotational speed (revolutions per minute) of the rotor as a function of flow rate of the diluent is substantially linear over a defined range of diluent flow rates;
• a pump connected to receive a supply of a fluid chemical product concentrate, the pump further connected to be driven by the rotation of the fluid drive unit, resulting in dispensation of the fluid chemical product concentrate into the reservoir responsive to rotation of the fluid drive unit such that a dilution ratio of a volume of the fluid chemical product concentrate dispensed per unit time versus a volume of diluent exiting the fluid drive unit per unit time is constant over the defined range of diluent flow rates;
• and
• a return home interface having an off position and a dispense position, the return home interface comprising:
• a lobe rotor configured to interface with the pump such that the pump is stopped at a desirable rotational index when the return home interface is in the off position.