Dispensing variable amounts of fluids

A process for calibrating a chemical dispensing system, the process comprising:

• opening a diluent valve coupled to a diluent inlet of an eductor to cause a flow of a diluent through the eductor;
• dispensing a chemical by opening a chemical inlet valve fluidly coupled between a chemical reservoir and a chemical pickup port of the eductor;
• measuring a flow rate of the chemical flowing from the chemical reservoir to the chemical pickup port;
• determining a time for the measured flow rate to reach a steady state flow rate;
• and
• generating a dispense duration curve based on the measured flow rate and the time to reach the steady state flow rate.

A chemical dispensing system comprising:

• a pulsing pump having an inlet and an outlet;
• a chemical manifold comprising a plurality of chemical inlets and a chemical outlet fluidly coupled to the inlet of the pulsing pump;
• a plurality of chemical valves having outlets fluidly coupled to the plurality of chemical inlets;
• a plurality of flow meters having outlets fluidly coupled to inlets of the plurality of chemical valves and inlets of the plurality of hall effect flow meters configured to be fluidly coupled to a plurality of chemical sources;
• and
• a controller communicatively coupled to the pulsing pump, the plurality of chemical valves, and the plurality of flow meters.