We use Cimcool 540 now. It comes in a clear version and a pink dyed version. We are using the clear version because the residue is clear. They will all leave residue as the water evaporates. We've used Valenite Turntech 700, and Jokisch Water soluble. The Valenite residue was a sticky blue, and it seemed to turn Al brown if left overnight. The Jokisch was a great coolant, but expensive and it would get bacteria quickly - smelly!
Fish |