Detecting a wash substance during a wash cycle of a washing machine appliance

A washing machine appliance comprising:

• a tub;
• a sensor assembly disposed at the tub, the sensor assembly configured to continuously record a conductivity measurement and a turbidity measurement of the tub;
• and a
• a controller, the controller operable for
• activating a wash cycle of the washing machine appliance;
• flowing a fill of liquid water to a tub of the washing machine appliance;
• flowing a wash substance to the tub of the washing machine appliance;
• monitoring, with a sensor assembly, conductivity measurements and turbidity measurements of the tub, wherein the conductivity measurements and the turbidity measurements are monitored for a predetermined amount of time;
• determining, based on the monitored conductivity measurements and the monitored turbidity measurement, a classification of the wash substance flowed to the tub of the washing machine appliance;
• and
• comparing the determined classification of the wash substance to a selected classification of the wash substance.