A method of reducing the corrosion of metal surfaces in a cooling system having {TAIL ~ a recirculating liquid coolant} comprising {HEAD ~ hard water}, said method comprising: 
A method of reducing the corrosion of metal surfaces in a cooling system having { TAIL ~ a recirculating liquid coolant } comprising { HEAD ~ hard water } , said method comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH