@TheClemReport Dump 3 gallon into 5 gallon
Refill 3 gallon and pour into 5 gallon until full (leaves 1 gallon left in 3 gallon)
Dump out 5 gallon and pour the 1 gallon into 5 gallon
Refill 3 gallon and pour into 5 gallon (which already has 1 gallon in it)