Yes salt lol. Thanks man!You mean putting salt in the water, right?
It lowers the freezing point of the water.
My Coleman Xtreme from Walmart usually will have ice still in it a day or so longer than my buddies’ high end rotomold coolers that they just toss bagged ice in.
When I went to ID last year, 6 days after loading frozen gallon jugs into the two yetis, the water was still frozen. I'll experiment this summer, maybe this spring since it's more like what the weather in ID is like in September.
I would like to get 10 to 12 days out of my first load of ice.