I also find that my liquid darkens after it vapes down. I usually refill it at that point and it lightens back up again to the bottle's color. I'm guess most
tanks would probably have this issue if you could see it in progress like you can with this one. Glad to know that these are pretty easily cleaned. I've got about 5 old w-mizers that quit producing vapor like they should and I'm curious if a good cleaning will revive them. Since they're not very cheap (I used Boge's in a syringe
tank before this), I'd love to find a way to get them working again. I purchased 2 w-mizers from EJM recently, and the first one I've got has something I've never experienced with these. The amount of vapor production is not consistant with anything. Sometimes it produces a lot of vapor, sometimes it produces very little. It's not tasting burnt or anything when it doesn't produce much, so I don't think it's a wicking issue. Tried it on other
batteries as well, so I know it's not the batt. I'm thinking maybe the wiring inside isn't done right somehow. I just keep on trucking though, and it eventually starts working again. Very weird though.