Originally Posted by OneHoppyGuy
rock salt will allow the use of less ice and we're talking about chilled water running against boiling wort
Git er done!
Well, I get that the rock salt increases the rate that the ice melts, thus driving the slurry temperature well below the freezing point, which for as long as the ice lasts you'd increase the chiller's cooling efficiency.
But you don't get that for free - the ice is
melting at a higher rate. So I don't know about the "use of less ice" part. I'll have to defer to your experience