A liquid dispenser for dispensing an effluent mixture comprises a manifold inlet connectable to a pressurized liquid source, at least one individual diluent outlet in fluid communication with the manifold inlet, and at least one backflow preventer and eductor system in fluid communication with the at least one individual diluent outlet. A flow regulator is in fluid communication with the at least one individual diluent outlet and the at least one backflow preventer and eductor system, located upstream of the at least one backflow preventer and eductor system and downstream of the at least one individual diluent outlet. The flow regulator is preferably individualized for the at least one backflow preventer and eductor system and interchangeable within the dispenser to facilitate a plurality of volumetric flow rates to the at least one respective backflow preventer and eductor system.