Abstract: An apparatus and method for precise dilution of a powder or liquid concentrate and maintenance of the resultant aqueous slurry apparatus is provided. The apparatus comprises at least one active solids level sensor, a controller, and control valves for providing additional water, slurry, or powder to the dilution. The method comprises determining with an active solids sensor a level of active solids in a dilution, transmitting the level of active solids to a controller, comparing with the controller the level of active solids with a predetermined active solids use level, and based on the active solids comparison, determining whether to deliver additional water or additional slurry or powder concentrate to the dilution.