A three way valve operates to direct {HEAD ~ the flow} of the concentrates into or bypassing a container located at {TAIL ~ a filling station} in which the chemical composition is formed 
A three way valve operates to direct { HEAD ~ the flow } of the concentrates into or bypassing a container located at { TAIL ~ a filling station } in which the chemical composition is formed
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH