Melt pool?!? Is this some new trendy name for some other trendy thing we haven't heard of yet? Nope!! it's a term used to describe wax that has been heated long enough to reach the edge of the container. Which takes approx 1-2 hours. WHY is this important? Because a full melt pool should be 1/8 to 1/4 inch deep which will allow the fragrance to disperse more completely into the room. Just give it chance to work it's smell good magic.