shake it up , last longer
this thing works great , there is almost no smell out of it and it seems to be well made , I don't know if it would take a drop on to asphalt but I guess you should not have in your car . the only issue I have is that it is a single use product . once the filter is clogged its done . for me this lasted about 6 months , but I don't enjoy myself as much as others do . after a while I noticed it was very hard to blow into it but I did get it to last a little longer by shaking it up a little , it seemed to loosen the carbon that's inside  . I would give it 5 stars if I was able to replace the carbon inside .
Rating: 4 stars