hey bud, "the blast' they are talking about is during the actual extraction of the oil. ..as the butane fills the tube, it stalls for a minute as it collects, then starts blasting out of the filter... its cool to see. if you wish to repurge, yeah just melt it in some hot water. let stand till there are no more bubbles. EDIT : LID OFF!! never heat an enclosed glass vessel. if you are planning to cook with the BHO, may i suggest while it is still liquid from repurging you infuse it to some Olive Oil.