Food waste disposal device (10) comprises: (a) an electric motor and grinding chamber; (b) a pump having an inlet for connecting with a source of bio-enzyme material (15) and an outlet (24) coupled to a grinder chamber; (c) an electro-responsive pump operator (30) that responds to being electrically energised by operating the pump to withdraw a predetermined quantity of bio-enzyme material from the source and discharge the quantity into grinding chamber; (d) an electric circuit including a switch to connect the circuit to an electric power source, a circuit including connections to the motor and electro-responsive pump actuator such that the pump actuator is energised to effect discharge of a quantity of bio-enzyme simultaneously with energisation of the motor. Also claimed are: (A) a method of reducing deposits of organic material in a conduit which comprises energising the motor for initiating organic material grinding operation and simultaneously injecting a predetermined quantity of bio-enzyme material into the disposer for discharging into conduit for the enzymes to mix with organic material in the disposer and into conduit for digesting the organic material deposits and (B) a device for withdrawing bio-enzyme material from a container which comprises: (a) a fixedly mountable container receiver for releasably engaging a container for bio-enzyme material and for holding the container in a fixed position; (b) a fixedly mounted pump having an inlet for immersion in the bio-enzyme material contents of the container (15), including a tubular stem (20) in which there is a bio-enzyme material discharge port, the stem responding to being depressed by issuing a predetermined quantity of bio-enzyme material out of the discharge port and into the device; (c) an electric pump operator (30) for depressing the tubular stem (20) and electric circuitry including a switch controlling the circuitry to energise the pump operator and the motor of disposer simultaneously to effect discharge of predetermined quantity of bio-enzyme material into the organic waste disposer each time the motor is started.    USE -   The device is mounted to a kitchen sink.    ADVANTAGE -   The device admits bio-enzymes into the organic waste disposal piping of a dwelling with no conscious involvement by a person.