I boil mine for 5 mins about 5-6 times. Works great but it still isn't the same as a new carto. They start to not last as long the more times I boil them too I noticed. I use boge 2.0 801s. However if I can get about a months worth of heavy vaping per carto. So to me it's worth it. $1 over 30 days? Much cheaper than a 1.5 PAD habit. I usually have about3 cartons in rotation and just boil them while making diner. Multi tasking at its finest!