A method of producing a synthetic fuel by treating fines of bituminous coal with an emulsion of a tall-oil mix, which may include enhancers that either increase the chemical change in the coal or reduce the cost of the synthetic fuel. A valve chamber is formed in the valve body into which the rotary plug may be positioned to control flow through the valve by rotation thereof. These materials and devices are applicable to many different fluid processing situations including drinking water treatment, wastewater treatment, emission treatment, pollution cleanup, and sensing fluid composition. A manifold main housing contains a purge valve and two three-way solenoids controlling respectively a secondary transfer valve and a pilot nozzle transfer valve. This technique maintains a consistent concentration of treatment chemical, dilutes organic matter deposited in the foot bath and effects removal of fibrous material while maintaining the foot bath in continual service for efficacious treatment.