text:  So one gallon is supposed to do 1.5 kilograms of scale. Interesting. And I was going to add two gallons, four gallons of distilled water and run it up the temp. And then it should do it in a number of hours, but I was going to run it to temp, cool it, run it to temp three times in over a 24-hour period, and then drain it and then flush it with distilled water.