I've gone through several packages of these cartos.Some of them have been amazing in terms of vapor production and have lasted the better part of a week of heavy use.Some have been disappointing from the start.Seems like,in a pack of 5,there are 1 or 2 great ones and the rest are nothing to brag about.I fill them all the same way,around 20 drops.I let them sit, after filling, for a couple of hours before use.I'm wondering if I'm doing something wrong and/or if anybody else is having this problem.I don't want to give up on them because the good ones work so darned great.Any help would be appreciated. Jim
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