Here's a tip for anyone that cares. lol
I got sick of getting all my flavors and all my cartridges mixed up so I took those little snack sized zip lock baggies and I wrote on little white labels what kind of juice the cart was used in and I keep each cart separate in zip lock baggies so when I want to switch flavors I'm not fumbling or always opening a new cart. Then I just clean the cart and filter out every so many days separately. Seems to be working nicely.
When I leave the house, all I do is take one cart with me and one tiny little thing of juice to top off with and an extra battery and atty. in case it blows. That way I don't back around all this stuff, no need to.
I got sick of getting all my flavors and all my cartridges mixed up so I took those little snack sized zip lock baggies and I wrote on little white labels what kind of juice the cart was used in and I keep each cart separate in zip lock baggies so when I want to switch flavors I'm not fumbling or always opening a new cart. Then I just clean the cart and filter out every so many days separately. Seems to be working nicely.