Abstract: Several improvements are provided for a microingredient additive dispensing system. One improvement is the use of a fluid eductor to entrain and mix the additives. Another improvement is to weigh and dispense ingredients using one or more non-compartmentalized vibratory trays that are mounted on a single weigh frame. Another improvement is a summing and filtering circuit that sums and filters the signals from four different load cells to accurately determine the weight of the dispensed additives. Yet another improvement is the placement of a pump upstream of the eductor, isolating the pump from additives that are pumped to the feed mixing station. Another improvement is a line-flushing mode in which a turbulent mixture of air and water are used to clean the delivery conduit of residue.