AFTER my mash out at 168F and I am waiting for my boil to start, I throw in some ice cubes and cold tap water that I treated with a camden tab. I let this sit for 60minutes or longer, drain and boil it for 15 minutes or until my gravity is at 1.030. Then chill that so I do not get all the crud in the canning process. Bring free starter wort inside and can it after the yeast pitch. I do not always do this but like to when I can.