As a repellent, I have found the Thermacell very effective, however the liquid in the cartridges evaporates quickly, without use, and the plastic cartridge waste is absurd in this day and age. Recycling is not the answer, refilling is.

I took my machine to use it and saw that all the liquide in the machine (refill) is lost. And I have a friend that the same happen….. at the cost of the refill is …. This is crazy

This is very effective, but I use it sparingly because I hate throwing the empty cartridges in the trash. We just don't need more plastic waste, and it would seem that these cartridges could be easily refilled. I'd happily pay for bulk refill liquid and whatever refill apparatus if any is required. From me personally, your revenues would increase (I'd use it much more often) and your company would get some well justified environmental cred.

The quality of the refills has diminished since I purchased this product over a year ago. It is still effective, however, in no way does it last as long as they advertise. Recently, it has not lasted half as long. I’m not sure if there has been a change in the solution but it is not what it used to be in duration. The refills are definitely overpriced. In addition, there should be a bottle to refill cartridges with in order to throw away less plastic. Thermacell can do better.