dissimilar flow rates pass through equal diameter pipes they result in unequal mixing this happens because the faster flow rate stream is at a higher velocity and moves past and does not mix with the other stream as it enters the static mixer in the present invention the flow of cupric is three times the flow of caustic therefore the diameter of the caustic input line needs to be roughly three times smaller than the diameter of the cupric input line flow area equal velocity thus providing equal velocity streams not only is it significant to maintain equal velocities of two streams so that more proportionate and thorough mixing is provided but also to prevent the formation and escape of gases such as chlorine before the resulting slurry enters the mixing tank which is open to the atmosphere if gas does form the confined and violent mixing in the 34 y 34 400 will immediately cause the gas to react with the incoming caustic the mix stream flows from the 45 u00b0 34 y 34 400 into the static mixer 335 the static mixer 335 is commercially available the automatic rinsing system utilized in this system in accordance with the invention can provide important controlled cleaning for the input pumps mixing zone and inline ph probe utilizing a very minimal amount of water typically less than two gallons the rinsing process is controlled by the controller 340 and automatically occurs a few minutes after the conversion of cupric chloride to copper oxide has been completed and lasts anywhere between several seconds to minutes depending upon the customer 39 s water pressure turning back to.