To drain or not to drain? Another ice chest question.

Adding salt lowers the temp and freezing point so adding drops the temp but melts it faster.

They wouldn't put salt on roads if it made it be ice longer.

It depends what is in the cooler; if a lot of stuff that would be damaged by water; sandwiches, etc I drain more often. Cans I leave the water in and when I add more ice I drain some.